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1. Administrative Counties of England and Wales, 1931

1931. Southall, Humphrey, Aucott, Paula, Bennett, Chris, and University of Portsmouth. These are digital boundaries for the system of counties essentially created by the 1889 Local Government Act and continuing to exist until 1974. Th... University of Portsmouth.

2. Hopkins Marine Life Refuge, Pacific Grove, California, 1931-1984

1931. Hopkins Marine Station. This polygon shapefile contains the original boundary of the Hopkins Marine Life Refuge (HMLR) as defined in Pacific Grove city ordinance No. 284 i... Stanford Digital Repository.

3. Ichimanbun no ichi chikeizu Shimoshizu oyobi Narashinohara kinbō, Maps Index

1931. Stanford Geospatial Center. This polygon shapefile is an index to 1:10,000 scale maps of Chiba (Japan), titled 'Ichimanbun no ichi chikeizu Shimoshizu oyobi Narashinohara kinb... Stanford Digital Repository.

4. New York-New Jersey: Ramapo Quadrangle

1931. United States. Geological Survey. This is a scanned historical map of the Ramapo Quadrangle in New York and New Jersey shown at a scale of 1:62,500. This map was created by the US G... US Geological Survey.

5. Nigeria conflated historical administrative boundaries, 1931

1931. Map and Geospatial Information Center, Lewis Library, Princeton University. Shapefile representing historical boundaries of provinces in Nigeria for 1931. GADM country-level administrative shapefiles were conflated with, an...

6. Nigeria extracted historical administrative boundaries, 1931

1931. Map and Geospatial Information Center, Lewis Library, Princeton University. Shapefile representing historical boundaries of provinces in Nigeria for 1931. Boundaries were extracted from a scanned British Colonial Office map.