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1. Gojūmanbun no ichi yochizu, Maps Index

1930. Stanford Geospatial Center. This polygon shapefile is an index to 1:500,000 scale maps of East Asia, titled 'Gojūmanbun no ichi yochizu .' This map series was originally produ... Stanford Digital Repository.

2. 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.