1991. U.S. Census Bureau. and GeoLytics, Inc. District boundaries for the 102nd United States Congress, Jan. 3, 1991 to Jan. 3, 1993. Harvard Geospatial Library.
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1991. Universidad Nacional Autonoma de Mexico. Instituto de Geografia. North Decimal Degree 75.000000. South Decimal Degree -75.000000. East Decimal Degr... Mexico, D. F. : [s.n.], 1991.
1991. American Nuclear Society. Map does not show facilities for the United States. Lists of organization, name, location, net output levels in MWe, reactor supplier, architect/en... La Grange Park, Ill. : Nuclear News, 1991.
1991. Environmental Systems Research Institute (Redlands, Calif.). This polygon shapefile contains the boundaries for Canada, Mexico, Greenland, the Dominican Republic, Cuba, Haiti, the Bahamas and Jamaica. This la... Environmental Systems Research Institute (Redlands, Calif.).
1991. Environmental Systems Research Institute (Redlands, Calif.). This polygon shapefile represents the time zones of the world. The time zones are best displayed with World Countries or World Administrative Divis... Environmental Systems Research Institute (Redlands, Calif.).