1990. Harvard Map Collection and Land Info (Firm). This polygon is an index to maps of the world, titled [Landsat 4/5 TM 30m 7-4-2 GeoCover 1990 (1988-1992) near-worldwide and worldwide satellite im... Harvard Map Collection.
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1990. Environmental Systems Research Institute, Inc. (ESRI) and Harvard Geospatial Library. U.S. Populated Place Points represents populated places within United States identified by the U.S. Bureau of the Census. Environmental Systems Research Institute, Inc. (ESRI).