http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Provides census data for U.S. congressional districts. Summary tape file 1D provides complete population data by age, race, and sex and housing data by occupancy/vacancy status, tenure, units in structure, contract rent, meals included in rent, value, and number of rooms in housing unit. Summary tape file 3D contains sample data weighted to represent the total population.
System requirements: IBM PC or compatible; requires MS-DOS 3.3 or higher; DOS file manager software (e.g., Microsoft CD-ROM Extensions 2.0 or higher); 64K RAM; CD-ROM drive.