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1. 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.

2. Municipal Boundaries: Brasil, 1920

1920. Instituto Brasileiro de Geografia e Estatística. This polygon shapefile contains the municipal boundaries of Brazil in 1920. These data were created using a custom World Polyconic projection. This... Instituto Brasileiro de Geografia e Estatística.

3. State Boundaries: Brasil, 1920

1920. Instituto Brasileiro de Geografia e Estatística. This polygon shapefile contains the state boundaries of Brazil in 1920. These data were created using a custom World Polyconic projection. This lay... Instituto Brasileiro de Geografia e Estatística.

4. New York: Childwold Quadrangle

1920. United States. Geological Survey. This is a scanned historical map of the Childwold Quadrangle in New York shown at a scale of 1:62,500. This map was created by the US Geological Su... US Geological Survey.

5. American Indian Reservations, Arizona, 1920

1920. University of Arizona. Library. Statewide coverage of 1920 American Indian Reservations. Boundaries that cross into the adjacent states are included. Population data is from the A... University of Arizona.

6. Census Places, Arizona, 1920

1920. University of Arizona. Library. Statewide coverage of 1920 Places based on population data available from the U.S. Bureau of the Census. Population data is from the Fourteenth Cen... University of Arizona.

7. Wards, Arizona, 1920

1920. University of Arizona. Library. Statewide coverage of 1920 Census City Wards for Arizona. Wards were identified from textual descriptions of boundaries. University of Arizona.