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21. 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.

22. 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.

23. Registration Counties of England and Wales, 1911

1911. Southall, Humphrey, Aucott, Paula, Bennett, Chris, University of Portsmouth, and Great Britain Historical Geographical Information System. These are digital boundaries for the system of counties used in England and Wales for vital registration and also for the administration and report... University of Portsmouth.

24. 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.

25. Registration Counties of England and Wales, 1901

1901. Southall, Humphrey, Aucott, Paula, Bennett, Chris, University of Portsmouth, and Great Britain Historical Geographical Information System. These are digital boundaries for the system of counties used in England and Wales for vital registration and also for the administration and report... University of Portsmouth.

26. 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.

27. Registration Counties of England and Wales, 1891

1891. Southall, Humphrey, Aucott, Paula, Bennett, Chris, University of Portsmouth, and Great Britain Historical Geographical Information System. These are digital boundaries for the system of counties used in England and Wales for vital registration and also for the administration and report... University of Portsmouth.

28. 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.

29. Scottish Counties, before 1890

1890. Southall, Humphrey, Aucott, Paula, Bennett, Chris, University of Portsmouth, and Great Britain Historical Geographical Information System. These are digital boundaries for the system of counties used in Scotland from medieval times and continuing to exist until 1975, broadly as aggrega... University of Portsmouth.

30. Registration Counties of England and Wales, 1881

1881. Southall, Humphrey, Aucott, Paula, Bennett, Chris, University of Portsmouth, and Great Britain Historical Geographical Information System. These are digital boundaries for the system of counties used in England and Wales for vital registration and also for the administration and report... University of Portsmouth.