SearchWorks

"Created from the Library Company of Philadelphia's acclaimed Afro-Americana Collection - an accumulation that begain with Benjamin Franklin and steadily increased throughout its entire history - this unique online resource provides researchers with more than 12,000 printed works. These essential books, pamphlets and broadsides, including many lesser-known imprints, hold an unparalleled record of African American history, literature and culture. This collection spans nearly 400 years, from the early 16th to the early 20th century. Critically important subjects covered include the West's discovery and exploitation of Africa; the rise of slavery in the New World along with the growth and success of abolitionist movements; the development of racial thought, including political protest and resistance to racism; descriptions of African American life -- slave and free -- throughout the Americans; and slavery and race in fiction and drama. Also featured are printed works of African American individuals and organizations."

NIST X-ray Photoelectron Spectroscopy (XPS) Database gives easy access to the energies of many photoelectron and Auger-electron spectral lines. Resulting from a critical evaluation of the published literature, the database contains over 22,000 line positions, chemical shifts, doublet splittings, and energy separations of photoelectron and Auger-electron lines. A highly interactive program allows the user to search by element, line type, line energy, and many other variables. Users can easily identify unknown measured lines by matching to previous measurements. Version 4.1 which contains an additional 4368 data records for a total of over 33,000 data records. Version 4.1 also contains new reference photoelectron binding energies, reference Auger-electron kinetic energies, and reference Auger parameters for many elemental solids from recent analyses of Handbook data. Wagner plots are now available for 61 elements.