Dewey Classification 16,459
Government Document 50,333
- British 305
- California 4,043
- Federal 34,033
- International 4,088
- Other 8,622
LC Classification 5,965,575 [remove]
- A - General Works 74,638
  - A - General Works 406
  - AC - Collections, Series, Collected Works 49,756
  - AE - Encyclopedias 981
  - AG - Dictionaries & Other General Reference Works 662
  - AI - Indexes 510
  - AM - Museums, Collectors & Collecting 2,590
  - AN - Newspapers 151
  - AP - Periodicals 5,063
  - AS - Academies & Learned Societies 9,908
  - AY - Yearbooks, Almanacs, Directories 2,392
  - AZ - History of Scholarship & Learning. The Humanities 1,584
- B - Philosophy, Psychology, Religion 407,783
  - B - Philosophy, Psychology, Religion 67,677
  - BC - Logic 2,812
  - BD - Speculative Philosophy 10,578
  - BF - Psychology, Parapsychology, Occult Sciences 38,341
  - BH - Aesthetics 3,544
  - BJ - Ethics, Social Usages, Etiquette 11,844
  - BL - Religions, Mythology, Rationalism 34,082
  - BM - Judaism 34,087
  - BP - Islam, Bahaism, Theosophy, etc. 37,234
  - BQ - Buddhism 14,933
  - BR - Christianity 27,559
  - BS - The Bible 28,280
  - BT - Doctrinal Theology 15,877
  - BV - Practical Theology 17,259
  - BX - Christian Denominations 63,706
- C - Auxiliary Sciences of History 47,076
  - C - Auxiliary Sciences of History 1,473
  - CB - History of Civilization 7,148
  - CC - Archaeology 3,914
  - CD - Diplomatics, Archives, Seals 6,492
  - CE - Technical Chronology, Calendar 664
  - CJ - Numismatics 4,703
  - CN - Inscriptions, Epigraphy 1,382
  - CR - Heraldry 2,488
  - CS - Genealogy 6,324
  - CT - Biography 12,452
- D - History (General) 780,750
  - D - History (General) 110,510
  - DA - Great Britain (History) 41,385
  - DAW - Central Europe (History) 394
  - DB - Austria, Liechtenstein, Hungary, Czechoslovakia, Czech Republic, Slovakia (History) 22,682
  - DC - France (History) 37,455
  - DD - Germany (History) 46,014
  - DE - Greco-Roman World (History) 2,135
  - DF - Greece (History) 7,795
  - DG - Italy, Malta (History) 31,585
  - DH - Low Countries, Belgium, Luxembourg (History) 2,059
  - DJ - Netherlands (Holland) (History) 1,107
  - DJK - Eastern Europe (General History) 2,293
  - DK - Russia, Soviet Union, Former Soviet Republics, Poland (History) 113,359
  - DL - Northern Europe, Scandinavia (History) 3,358
  - DP - Spain. Portugal (History) 18,458
  - DQ - Switzerland (History) 2,895
  - DR - Balkan Peninsula (History) 34,213
  - DS - Asia (History) 225,285
  - DT - Africa (History) 71,935
  - DU - Oceania (South Seas) (History) 5,230
  - DX - Romanies (Gypsies) (History) 866
- E - America, United States (General History) 80,359
  - E - America, United States (General History) 80,359
- F - United States, British, Dutch, French, Latin America (Local History) 141,509
  - F - United States, British, Dutch, French, Latin America (Local History) 141,486
- G - Geography, Atlases, Globes, Maps 185,865
  - G - Geography, Atlases, Globes, Maps 91,907
  - GA - Mathematical Geography, Cartography 2,229
  - GB - Physical Geography 6,822
  - GC - Oceanography 3,876
  - GE - Environmental Sciences 6,841
  - GF - Human Ecology, Anthropogeography 3,788
  - GN - Anthropology 24,179
  - GR - Folklore 11,589
  - GT - Manners & Customs 10,772
  - GV - Recreation. Leisure 23,866
- H - Social Sciences (General) 843,567
  - H - Social Sciences (General) 17,372
  - HA - Statistics 13,365
  - HB - Economic Theory, Demography 38,039
  - HC - Economic History & Conditions 122,122
  - HD - Industries, Land use, Labor 197,567
  - HE - Transportation & Communications 27,966
  - HF - Commerce 65,239
  - HG - Finance 50,864
  - HJ - Public Finance 19,381
  - HM - Sociology 28,421
  - HN - Social History & Conditions 38,765
  - HQ - Family, Marriage, Gender & Sexuality 73,670
  - HS - Societies: Secret, Benevolent, etc. 3,704
  - HT - Communities, Classes, Races 26,559
  - HV - Social Pathology, Social & Public Welfare, Criminology 76,753
  - HX - Socialism, Communism, Utopias, Anarchism 44,049
- J - Political Science (Legislative & Executive papers) 203,307
  - J - Political Science (Legislative & Executive papers) 3,844
  - JA - Political Science (General) 9,450
  - JC - Political Theory 31,036
  - JF - Political Institutions & Public Administration (General) 7,280
  - JJ - Political Institutions & Public Administration (North America) 6
  - JK - Political Institutions & Public Administration (U.S.) 13,315
  - JL - Political Institutions & Public Administration (Canada, Latin America) 12,979
  - JN - Political Institutions & Public Administration (Europe) 37,641
  - JQ - Political Institutions & Public Administration (Asia, Africa, Australia, Pacific Area) 30,089
  - JS - Local Government, Municipal Government 10,433
  - JV - Colonies & Colonization, Emigration & Immigration 12,004
  - JX - International Law 21,367
  - JZ - International Relations 13,877
- K - Law 243,621
  - K - Law 44,990
  - KB - Religious Law (General) 119
  - KBM - Jewish Law 407
  - KBP - Islamic Law 4,796
  - KBR - History of Canon law 423
  - KBS - Canon law of Eastern churches 13
  - KBT - Canon law of Eastern Rite Churches in Communion with the Holy See of Rome 4
  - KBU - Law of the Roman Catholic Church. The Holy See 525
  - KD - Law of England & Wales 14,493
  - KDC - Law of Scotland 1,402
  - KDE - Law of Northern Ireland 88
  - KDG - Law of Isle of Man, Channel Islands 22
  - KDK - Law of Ireland (EIRE) 499
  - KDZ - Law of America, North America 660
  - KE - Law of Canada 3,232
  - KEA - Law of Alberta 141
  - KEB - Law of British Columbia 151
  - KEM - Law of Manitoba 73
  - KEN - Law of New Brunswick, Newfoundland, Northwest Territories, Nova Scotia 86
  - KEO - Law of Ontario 204
  - KEP - Law of Prince Edward Island 5
  - KEQ - Law of Quebec 214
  - KES - Law of Saskatchewan 48
  - KEY - Law of Yukon Territory 4
  - KEZ- Law of Individual Canadian cities 2
  - KF - Law of the U.S. 66,120
  - KFA - Law of Alabama, Alaska, Arizona, Arkansas 351
  - KFC - Law of California, Colorado, Connecticut 6,342
  - KFD - Law of Delaware, District of Columbia 197
  - KFF - Law of Florida 161
  - KFG - Law of Georgia 139
  - KFH - Law of Hawaii 180
  - KFI - Law of Idaho, Illinois, Indiana, Iowa 618
  - KFK - Law of Kansas, Kentucky 282
  - KFL - Law of Louisiana 268
  - KFM - Law of Maine, Maryland, Massachusetts, Michigan, Minnesota, Mississippi, Missouri, Montana 1,114
  - KFN - Law of Nebraska, Nevada, New Hampshire, New Jersey, New Mexico, New York, North Carolina, North Dakota 2,004
  - KFO - Law of Ohio, Oklahoma, Oregon 359
  - KFP - Law of Pennsylvania 291
  - KFR - Law of Rhode Island 62
  - KFS - Law of South Carolina, South Dakota 137
  - KFT - Law of Tennessee, Texas 462
  - KFU - Law of Utah 66
  - KFV - Law of Vermont, Virginia 286
  - KFW - Law of Washington, West Virginia, Wisconsin, Wyoming 405
  - KFX - Law of Individual U.S. cities 431
  - KFZ - Law of Northwest Territory, Confederate States of America 17
  - KG - Law of Latin America 1,086
  - KGA - Belize 11
  - KGB - Law of Costa Rica 241
  - KGC - Law of El Salvador 128
  - KGD - Law of Guatemala 358
  - KGE - Law of Honduras 90
  - KGF - Law of Mexico 3,140
  - KGG - Law of Nicaragua 205
  - KGH - Law of Panama, Panama Canal Zone 182
  - KGJ - Law of Caribbean area (General), Anguilla 62
  - KGK - Law of Antigua and Barbuda, Aruba 4
  - KGL - Law of Bahamas, Barbados, British Leeward Islands, British Virgin Islands, British West Indies, British Windward Islands, West Indies (Federation) 71
  - KGM - Law of the Cayman Islands 5
  - KGN - Law of Cuba 227
  - KGP - Law of Curaçao, Dominica 4
  - KGQ - Law of the Dominican Republic 64
  - KGR - Law of Dutch Leeward Islands, Dutch West Indies (Netherlands Antilles), Dutch Windward Islands, French West Indies, Grenada 18
  - KGS - Law of Haiti 121
  - KGT - Law of Jamaica, Martinique, Montserrat 24
  - KGV - Law of Puerto Rico 94
  - KGW - Law of Saba - Saint Christopher (Saint Kitts), Nevis, and Anguilla - Saint Lucia - Saint Vincent and the Grenadines - Sint Eustatius -Sint Maarten 16
  - KGX - Law of Trinidad and Tobago 14
  - KGY - Law of Turks and Caicos Islands 1
  - KGZ - Law of Virgin Islands of the United States 7
  - KH - Law of South America 173
  - KHA - Law of Argentina 740
  - KHC - Law of Bolivia 886
  - KHD - Law of Brazil 1,767
  - KHF - Law of Chile 983
  - KHH - Law of Colombia 1,641
  - KHK - Law of Ecuador 543
  - KHL - Law of Falkland Islands 1
  - KHM - Law of French Guiana 2
  - KHN - Law of Guyana 26
  - KHP - Law of Paraguay 57
  - KHQ - Law of Peru 660
  - KHS - Law of Suriname 2
  - KHU - Law of Uruguay 227
  - KHW - Law of Venezuela 1,029
  - KI - Law of indigenous peoples 1
  - KIA - Law of indigenous peoples of the Americas 2
  - KIB - Law of indigenous peoples: Canada (General) 4
  - KIC - Law of indigenous peoples: Canada—Eastern 2
  - KID - Law of indigenous peoples: Canada—Western 1
  - KIE - Law of indigenous peoples: United States (General) 17
  - KIF - Law of indigenous peoples: United States—Northeast Atlantic 2
  - KIG - Law of indigenous peoples: United States—South 3
  - KIH - Law of indigenous peoples: United States—North Central 7
  - KIK - Law of indigenous peoples: United States—New Southwest 2
  - KJ - History of law: Europe 392
  - KJA - Roman Law 1,764
  - KJC - Europe: Regional Comparative & Uniform Law 3,752
  - KJE - Europe: Regional Organization & Integration 5,543
  - KJG - Law of Albania 37
  - KJH - Law of Andorra 3
  - KJJ - Law of Austria 655
  - KJK - Law of Belgium, Bosnia and Hercegovina (Federation), Republika Srpska 179
  - KJM - Law of Bulgaria, Croatia (Kingdom), Croatia (1992- ) 238
  - KJN - Law of Cyprus 24
  - KJP - Law of Czechoslovakia (to 1993), Czech Republic (1993- ) 239
  - KJQ - Law of Slovakia (1993- ) 24
  - KJR - Law of Denmark 81
  - KJS - Law of Estonia 74
  - KJT - Law of Finland 90
  - KJV - Law of France 4,109
  - KJW - Law of French Regions, Provinces, Departments 132
  - KK - Law of Germany 5,912
  - KKA - Law of East Germany 282
  - KKB - Law of German states and provinces (A-Pr) 226
  - KKC - Law of German states and provinces (Ps-Z) 148
  - KKE - Law of Greece 77
  - KKF - Law of Hungary 243
  - KKG - Law of Iceland 13
  - KKH - Law of Italy, Kosovo 3,576
  - KKI - Law of Latvia 114
  - KKJ - Law of Liechtenstein, Lithuania 122
  - KKK - Law of Luxemburg, Macedonia (Republic) (1992- ), Malta 34
  - KKL - Law of Monaco, Montenegro 11
  - KKM - Law of the Netherlands 236
  - KKN - Law of Norway 58
  - KKP - Law of Poland 998
  - KKQ - Law of Portugal 143
  - KKR - Law of Romania 271
  - KKS - Law of San Marino, Serbia (Kingdom), Serbia (2006- ), Slovenia (1992- ) 54
  - KKT - Law of Spain 1,505
  - KKV - Law of Sweden 258
  - KKW - Law of Switzerland 835
  - KKX - Law of Turkey 614
  - KKY - Law of Ukraine 424
  - KKZ - Law of Yugoslavia. Serbia and Montenegro (to 2006) 406
  - KL - History of Law, The Ancient Orient 365
  - KLA - Law of Russia, Soviet Union 1,347
  - KLB - Law of Russia (Federation, 1992- ) 1,679
  - KLD - Law of Armenian SSR (to 1991) 15
  - KLE - Law of Azerbaijan 63
  - KLF - Law of Belarus (Republic) 214
  - KLH - Law of Georgia (Republic) 43
  - KLM - Law of Moldova 141
  - KLN - Law of Russian S.F.S.R. (to 1991) 53
  - KLP - Law of Ukraine (1919-1991), Zakavkazskaia͡ Sots͡ialisticheskaia͡ Federativnaia͡ Sovetskaia͡ Respublika (to 1936) 95
  - KLR - Law of Kazakhstan 191
  - KLS - Law of Kyrgyzstan 112
  - KLT - Law of Tajikistan 45
  - KLV - Law of Turkmenistan 20
  - KLW - Law of Uzbekistan 136
  - KM - Law of Asia 185
  - KMC - Law of the Middle East, Southwest Asia: Regional comparative and uniform law 261
  - KME - Middle East. Southwest Asia: Regional comparative and uniform law: Regional organization and integration 1
  - KMF - Law of Armenia (Republic), Bahrain 27
  - KMG - Law of Gaza 5
  - KMH - Law of Iran 190
  - KMJ - Law of Iraq 86
  - KMK - Law of Israel 527
  - KML - Law of Jerusalem 18
  - KMM - Law of Jordan, West Bank 94
  - KMN - Law of Kuwait 35
  - KMP - Law of Lebanon 158
  - KMQ - Law of Oman, Palestine (to 1948) 34
  - KMS - Law of Qatar 4
  - KMT - Law of Saudi Arabia 66
  - KMU - Law of Syria 25
  - KMV - Law of United Arab Emirates 21
  - KMX - Law of Yemen 19
  - KMY - Law of Yemen (People's Democratic Republic) (to 1990) 3
  - KNC - Asia (South Asia. Southeast Asia. East Asia): Regional comparative and uniform law 442
  - KNE - Asia (South Asia. Southeast Asia. East Asia): Regional organization and integration 21
  - KNF - Afghanistan 158
  - KNG - Law of Bangladesh 43
  - KNH - Law of Bhutan 13
  - KNK - Law of Brunei 2
  - KNL - Law of Burma 26
  - KNM - Law of Cambodia 24
  - KNN - Law of China 1,162
  - KNP - Law of Taiwan 302
  - KNQ - Law of China (People's Republic, 1949- ) 3,212
  - KNR - Law of Hong Kong (to 1997) 224
  - KNS - Law of India 1,866
  - KNT - Law of India: States and union territories (A-L) 50
  - KNU - Law of India: States and union territories (M-Z) 49
  - KNV - Law of French Indochina. Indochina (Federation) 1
  - KNW - Law of Indonesia, East Timor 164
  - KNX - Law of Japan 2,237
  - KNY - Law of Japan: Cities, communities, etc. 3
  - KPA - Law of Korea. South Korea 811
  - KPC - Law of Democratic People's Republic of Korea. North Korea 77
  - KPE - Law of Laos 7
  - KPF - Law of Macau (to 1999) 18
  - KPG - Law of Malaysia. States of East and West Malaysia (1957- ) (Part 1) 117
  - KPH - Law of Malaysia: States of East and West Malaysia (1957- ) (Part 2) 6
  - KPJ - Law of Mongolia 24
  - KPK - Law of Nepal 47
  - KPL - Law of Pakistan 205
  - KPM - Law of the Philippines 376
  - KPP - Law of Singapore 71
  - KPS - Law of Sri Lanka 100
  - KPT - Law of Thailand 45
  - KPV - Law of Vietnam 36
  - KPW - Law of Vietnam (Republic). South Vietnam 4
  - KQ - Law of Africa 80
  - KQC - Africa: Regional comparative and uniform law 1,024
  - KQE - Africa: Regional organization and integration 74
  - KQG - Law of Algeria 145
  - KQH - Law of Angola 86
  - KQJ - Law of Benin 89
  - KQK - Law of Botswana 129
  - KQM - Law of British Central Africa Protectorate 2
  - KQP - Law of British Indian Ocean Territory, British Somaliland 4
  - KQT - Law of Burkina Faso 47
  - KQV - Law of Burundi 42
  - KQW - Law of Cameroon 206
  - KQX - Law of Cape Verde 28
  - KRB - Law of Central African Republic 19
  - KRC - Law of Chad 23
  - KRE - Law of Comoros 13
  - KRG - Law of Congo (Brazzaville) 35
  - KRK - Law of Djibouti 14
  - KRL - Law of East Africa Protectorate 32
  - KRM - Law of Egypt (United Arab Republic) 402
  - KRN - Law of Eritrea 18
  - KRP - Law of Ethiopia 126
  - KRR - Law of French Equatorial Africa 2
  - KRS - Law of French West Africa 29
  - KRU - Law of Gabon 39
  - KRV - Law of Gambia 27
  - KRW - Law of German East Africa 1
  - KRX - Law of Ghana 214
  - KRY - Law of Gibraltar 3
  - KSA - Law of Guinea 34
  - KSC - Law of Guinea-Bissau 85
  - KSE - Law of Equatorial Guinea, Ifni 7
  - KSG - Law of Italian East Africa, Italian Somaliland 1
  - KSH - Law of Côte d'Ivoire 68
  - KSK - Law of Kenya 387
  - KSL - Law of Lesotho 77
  - KSN - Law of Liberia 31
  - KSP - Law of Libya 17
  - KSR - Law of Madagascar 91
  - KSS - Law of Malawi 145
  - KST - Law of Mali 35
  - KSU - Law of Mauritania 19
  - KSV - Law of Mauritius, Mayotte 44
  - KSW - Law of Morocco 320
  - KSX - Law of Mozambique 172
  - KSY - Law of Namibia 207
  - KSZ - Law of Niger 29
  - KTA - Law of Nigeria 889
  - KTC - Law of Réunion 3
  - KTD - Law of Rwanda 114
  - KTE - Law of Saint Helena 9
  - KTF - Law of Sao Tome and Principe 8
  - KTG - Law of Senegal 207
  - KTH - Law of Seychelles 27
  - KTJ - Law of Sierra Leone 32
  - KTK - Law of Somalia 20
  - KTL - Law of South Africa, Republic of 1,376
  - KTM - Law of South Sudan (2011- ) 4
  - KTQ - Law of Sudan 81
  - KTR - Law of Swaziland 49
  - KTT - Law of Tanzania 260
  - KTU - Law of Togo 48
  - KTV - Law of Tunisia 102
  - KTW - Law of Uganda 278
  - KTX - Law of Congo (Democratic Republic) 211
  - KTY - Law of Zambia, Zanzibar (to 1964) 183
  - KTZ - Law of Zimbabwe 273
  - KU - Law of Australia 1,552
  - KUA - Law of Australian Capital Territory 7
  - KUB - Law of Northern Territory 8
  - KUC - Law of New South Wales 208
  - KUD - Law of Queensland 65
  - KUE - Law of South Australia 19
  - KUF - Law of Tasmania 38
  - KUG - Law of Victoria 64
  - KUH - Law of Western Australia 171
  - KUQ - Law of New Zealand 353
  - KVB - Law of Pacific area jurisdictions: Regional comparative and uniform law: Australia and New Zealand 26
  - KVC - Law of Pacific area jurisdictions: Regional comparative and uniform law: Other Pacific area jurisdictions (Australasia, Oceania) 58
  - KVE - Law of Pacific area jurisdictions: Regional comparative and uniform law: Regional organization and integration. Pacific area cooperation 1
  - KVH - Law of American Samoa, British New Guinea (Territory of Papua) 6
  - KVN - Law of Fiji 15
  - KVP - Law of French Polynesia (Including the island groups of Austral, Society (Tahiti), Tuamotu, Gambier, and Marquesas), German New Guinea (to 1914) 7
  - KVQ - Law of Guam 30
  - KVR - Law of Kiribati (Including Gilbert, Phoenix, and Line Islands) 2
  - KVS - Law of Marshall Islands, Micronesia (Federated States), Midway Islands 3
  - KVU - Law of Nauru, Netherlands New Guinea (to 1963) 3
  - KVW - Law of New Caledonia 6
  - KWA - Law of Niue 1
  - KWC - Law of Northern Mariana Islands 4
  - KWE - Law of Pacific Islands (Trust Territory) 3
  - KWG - Law of Palau 1
  - KWH - Law of Papua New Guinea 55
  - KWL - Law of Pitcairn Island, Solomon Islands 5
  - KWP - Law of Tonga 1
  - KWQ - Law of Tuvalu 2
  - KWR - Law of Vanuatu 5
  - KWW - Law of Samoa 6
  - KWX - Law of Antarctica 84
  - KZ - Law of Nations 10,367
  - KZA - Law of the sea 1,021
  - KZD - Law of outer space 363
- L - Education 139,125
  - L - Education 18,461
  - LA - History of Education 25,862
  - LB - Theory & Practice of Education 51,739
  - LC - Special Aspects of Education 31,839
  - LD - Individual Educational Institutions: United States 2,252
  - LE - Individual Educational Institutions: America (except U.S.) 1,411
  - LF - Individual Educational Institutions: Europe 4,614
  - LG - Individual Educational Institutions: Asia, Africa, Oceania 2,558
  - LH - College & School Magazines & Papers 154
  - LJ - Student Fraternities & Societies (U.S.) 77
  - LT - Textbooks 179
- M - Music 250,552
  - M - Music 148,948
  - ML - Literature on Music 91,511
  - MT - Musical Instruction & Study 10,057
- N - Visual Arts 273,911
  - N - Visual Arts 99,183
  - NA - Architecture 42,795
  - NB - Sculpture 14,184
  - NC - Drawing, Design, Illustration 15,517
  - ND - Painting 61,490
  - NE - Print Media 8,660
  - NK - Decorative Arts, Applied Arts, Decoration & Ornament 21,234
  - NX - Arts in General 10,877
- P - Philology, Linguistics (General) 1,342,110
  - P - Philology, Linguistics (General) 49,954
  - PA - Classical Philology, Greek & Latin Languages & Literatures 31,987
  - PB - Modern Languages, Celtic Languages 2,390
  - PC - Romance Philology & Languages 21,105
  - PD - Germanic Philology & Languages 1,986
  - PE - English Philology & Language 12,904
  - PF - West Germanic Philology & Languages 6,448
  - PG - Slavic, Baltic, Albanian Languages & Literatures 139,293
  - PH - Uralic, Basque Languages & Literatures 6,242
  - PJ - Oriental Philology & Literature 65,136
  - PK - Indo-Iranian Philology & Literature 17,617
  - PL - Languages & Literatures of Eastern Asia, Africa, Oceania 115,398
  - PM - Hyperborean, Indian & Artificial Languages 5,849
  - PN - Literature (General) & Journalism 169,555
  - PQ - French, Italian, Spanish & Portuguese Literature 297,838
  - PR - English Literature 155,025
  - PS - American & Canadian Literatures 133,213
  - PT - German & Germanic Literatures 81,546
  - PZ - Fiction & Children's Literature 28,963
- Q - Science (General) 362,434
  - Q - Science (General) 33,402
  - QA - Mathematics 110,324
  - QB - Astronomy 12,774
  - QC - Physics 43,664
  - QD - Chemistry 23,314
  - QE - Geology 28,733
  - QH - Natural History, Biology 37,402
  - QK - Botany 13,106
  - QL - Zoology 24,237
  - QM - Human Anatomy 2,416
  - QP - Physiology 25,286
  - QR - Microbiology 7,870
- R - Medicine (General) 159,604
  - R - Medicine (General) 24,939
  - RA - Public Aspects of Medicine 33,165
  - RB - Pathology 3,651
  - RC - Internal Medicine 56,079
  - RD - Surgery 10,072
  - RE - Ophthalmology 2,478
  - RF - Otorhinolaryngology 1,151
  - RG - Gynecology & Obstetrics 5,670
  - RJ - Pediatrics 7,517
  - RK - Dentistry 814
  - RL - Dermatology 1,162
  - RM - Therapeutics, Pharmacology 6,217
  - RS - Pharmacy & Materia Medica 3,316
  - RT - Nursing 2,836
  - RV - Botanic, Thomsonian, & Eclectic Medicine 30
  - RX - Homeopathy 199
  - RZ - Other Systems of Medicine 303
- S - Agriculture (General) 38,207
  - S - Agriculture (General) 12,653
  - SB - Plant Culture 11,140
  - SD - Forestry 4,581
  - SF - Animal Culture 4,535
  - SH - Aquaculture, Fisheries, Angling 4,156
  - SK - Hunting Sports 1,142
- T - Technology (General) 226,232
  - T - Technology (General) 15,897
  - TA - Engineering, Civil Engineering 36,548
  - TC - Hydraulic Engineering 4,164
  - TD - Environmental Technology, Sanitary Engineering 16,504
  - TE - Highway Engineering, Roads & Pavements 1,144
  - TF - Railroad Engineering & Operation 1,935
  - TG - Bridge Engineering 873
  - TH - Building Construction 4,428
  - TJ - Mechanical Engineering & Machinery 13,066
  - TK - Electrical Engineering, Electronics, Nuclear Engineering 42,897
  - TL - Motor Vehicles, Aeronautics, Astronautics 19,279
  - TN - Mining Engineering, Metallurgy 11,223
  - TP - Chemical Technology 14,136
  - TR - Photography 20,504
  - TS - Manufactures 8,768
  - TT - Handicrafts. Arts & Crafts 2,280
  - TX - Home Economics 12,594
- U - Military Science (General) 44,339
  - U - Military Science (General) 13,365
  - UA - Armies 16,497
  - UB - Military Administration 5,421
  - UC - Maintenance & Transportation 890
  - UD - Infantry 429
  - UE - Cavalry, Armor 236
  - UF - Artillery 1,107
  - UG - Military Engineering, Air Forces, Military Astronautics 5,806
  - UH - Other Military Services 607
- V - Naval Science (General) 9,666
  - V - Naval Science (General) 3,039
  - VA - Navies 2,056
  - VB - Naval Administration 264
  - VC - Naval Maintenance 72
  - VD - Naval Personnel 14
  - VE - Marines 220
  - VF - Naval Ordnance 57
  - VG - Minor Services of Navies 253
  - VK - Navigation, Merchant Marine 1,704
  - VM - Naval Architecture, Marine Engineering 1,986
- Z - Bibliography, Library Science, Information Resources 113,771
  - Z - Bibliography, Library Science, Information Resources 112,772
  - ZA - Information Resources (General) 998