http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
1 computer laser optical disk ; 4 3/4 in.
Includes decennial census-relevant geographic information; data for all 1990 census map features and boundaries, the associated 1990 census final tabulation geographic area codes, and the codes for the Jan. 1, 1990 legal and statistical areas on both sides of each line segment of every mapped feature; final voting district codes and the 1990 census designated place codes; technical documentation.
System requirements: Computer system capable of using CD-ROM drive; 640K; application software, if IBM compatible personal computer, requires also CD-ROM software, such as Microsoft CD-ROM Extensions (version 2.0 or higher); CD-ROM drive.