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11. Historical United States County Boundaries, 1950

1950. 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 1950. Attributes include county and state names as well as FIPS identifi... Geoscience Publications.

12. 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.

13. 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.

14. 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.

15. 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.