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1. South Dakota Block Groups 2002

2002. Geographic Data Technology, Inc. (GDT). South Dakota Block Groups represents the U.S. Census block groups of South Dakota. Environmental Systems Research Institute, Inc. (ESRI).

2. South Dakota Tracts 2002

2002. Geographic Data Technology, Inc. (GDT). South Dakota Tracts represents the U.S. Census tracts and block numbering areas (BNA) of South Dakota. Environmental Systems Research Institute, Inc. (ESRI).

3. South Dakota ZIP Code Areas 2002

2001. Geographic Data Technology, Inc. (GDT). South Dakota ZIP Code Areas represents five-digit ZIP Code areas used by the U.S. Postal Service to deliver mail more effectively. The first digit... Environmental Systems Research Institute, Inc. (ESRI).

4. South Dakota Block Centroid Populations 2002

2000. Environmental Systems Research Institute, Inc. (ESRI). South Dakota Block Centroid Populations represents the population of the U.S. Census block centroids for South Dakota. U.S. Census blocks are the ... Environmental Systems Research Institute, Inc. (ESRI).

5. South Dakota Major Roads 2002

1999. Geographic Data Technology, Inc. (GDT). South Dakota Major Roads represents interstate, U.S., and state highways and other major thoroughfares within South Dakota. Environmental Systems Research Institute, Inc. (ESRI).

6. South Dakota Rivers 2002

1997. Geographic Data Technology, Inc. (GDT). South Dakota Rivers represents streams and rivers within South Dakota. Environmental Systems Research Institute, Inc. (ESRI).

7. Historical United States County Boundaries, 1990

1990. Earle, Carville, Heppen, John, Louisiana State University (Baton Rouge, La.). Department of Geography and Anthropology., Otterstrom, Samuel, and Cao, Changyong. This polygon shapefile contains county boundaries for the United States in 1990. Attributes include county and state names as well as FIPS identifi... Geoscience Publications.

8. Historical United States County Boundaries, 1980

1980. Earle, Carville, Heppen, John, Louisiana State University (Baton Rouge, La.). Department of Geography and Anthropology., Otterstrom, Samuel, and Cao, Changyong. This polygon shapefile contains county boundaries for the United States in 1980. Attributes include county and state names as well as FIPS identifi... Geoscience Publications.

9. Historical United States County Boundaries, 1970

1970. Earle, Carville, Heppen, John, Louisiana State University (Baton Rouge, La.). Department of Geography and Anthropology., Otterstrom, Samuel, and Cao, Changyong. This polygon shapefile contains county boundaries for the United States in 1970. Attributes include county and state names as well as FIPS identifi... Geoscience Publications.

10. Historical United States County Boundaries, 1960

1960. Earle, Carville, Heppen, John, Louisiana State University (Baton Rouge, La.). Department of Geography and Anthropology., Otterstrom, Samuel, and Cao, Changyong. This polygon shapefile contains county boundaries for the United States in 1960. Attributes include county and state names as well as FIPS identifi... Geoscience Publications.