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21. United States County Boundary Files, 1970

1999. Louisiana State University (Baton Rouge, La.).; Dept. of Geography and Anthropology., Earle, Carville., Heppen, John., and Otterstrom, Samuel. The Historical United States County Boundary Files 1970 contains ArcView shapefile format U.S. county boundary files for 1970. Files include county...

22. United States County Boundary Files, 1980

1999. Louisiana State University (Baton Rouge, La.).; Dept. of Geography and Anthropology., Earle, Carville., Heppen, John., and Otterstrom, Samuel. The Historical United States County Boundary Files 1980 contains ArcView shapefile format U.S. county boundary files for 1980. Files include county...

23. United States County Boundary Files, 1990

1999. Louisiana State University (Baton Rouge, La.).; Dept. of Geography and Anthropology., Earle, Carville., Heppen, John., and Otterstrom, Samuel. The Historical United States County Boundary Files 1990 contains ArcView shapefile format U.S. county boundary files for 1990. Files include county...

24. United States County Boundary Files, 1999

1999. Louisiana State University (Baton Rouge, La.).; Dept. of Geography and Anthropology., Earle, Carville., Heppen, John., and Otterstrom, Samuel. The Historical United States County Boundary Files 1999 contains ArcView shapefile format U.S. county boundary files for 1999. Files include county...