The great American history machine [electronic resource] : an interactive atlas of the 19th and 20th century : United States social and political history
- Program version 2.0; Data & Map Library version 1.1.
- College Park, Md. : ePress Project, Academic Software Development Group, Computer Science Center, University of Maryland, c1995.
- Physical description
- 1 CD-ROM : col. ; 4 3/4 in. + user manual (28 p. : ill. ; 28 cm.)
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