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1. 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.
2. 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.
3. 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.
4. 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.
5. Historical United States County Boundaries, 1890
1890. 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 1890. Attributes include county and state names as well as FIPS identifi... Geoscience Publications.
6. Historical United States County Boundaries, 1900
1900. 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 1900. Attributes include county and state names as well as FIPS identifi... Geoscience Publications.
7. Historical United States County Boundaries, 1910
1910. 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 1910. Attributes include county and state names as well as FIPS identifi... Geoscience Publications.
8. Historical United States County Boundaries, 1920
1920. 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 1920. Attributes include county and state names as well as FIPS identifi... Geoscience Publications.
9. Historical United States County Boundaries, 1930
1930. 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 1930. Attributes include county and state names as well as FIPS identifi... Geoscience Publications.
10. Historical United States County Boundaries, 1940
1940. 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 1940. Attributes include county and state names as well as FIPS identifi... Geoscience Publications.