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university-of-illinois-urbana-champaign

1. Historical Aerial Photography: Illinois, 1937-1947

1936-1941. Illinois State Geological Survey. The primary data set consists of historical black and white aerial photographs from Illinois acquired during 1936 to 1941. Alternative years of pho...
university-of-maryland

3. Wetlands: Maryland, 1972

1972. ArcGIS Online for Maryland. This is a MD iMAP hosted service. Find more information on http://imap.maryland.gov.This is a map service of the 1972 Wetland Maps. These are guida...