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1. California Block Centroid Populations 2002

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

2. California Block Groups 2002

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

3. California Major Roads 2002

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

4. California Rivers 2002

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

5. California Tracts 2002

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

6. California ZIP Code Areas 2002

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

7. Historical United States County Boundaries, 1850

1850. 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 1850. Attributes include county and state names as well as FIPS identifi... Geoscience Publications.

8. Historical United States County Boundaries, 1860

1860. 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 1860. Attributes include county and state names as well as FIPS identifi... Geoscience Publications.

9. Historical United States County Boundaries, 1870

1870. 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 1870. Attributes include county and state names as well as FIPS identifi... Geoscience Publications.

10. Historical United States County Boundaries, 1880

1880. 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 1880. Attributes include county and state names as well as FIPS identifi... Geoscience Publications.