1939. U-Spatial. Political national boundaries as they were in 1939. Sources: Rand McNally Popular Maps. (1939). Rand McNally & Company acquired April 14, 2016 fro...
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1945. U-Spatial. Political national boundaries as they were in 1945. Sources: The World Mercator’s Projection. (1944). Army Map Service, Washington, D.C. Invasion ...
1970. U-Spatial. Political national boundaries as they were in 1970. Source: 1971 Commercial Atlas & Marketing Guide, 102nd Edition. (1971). Rand McNally & Company,...
1990. U-Spatial. Political national boundaries as they were in 1990. Source: Hammond World Map. (1992). Hammond Incorporated.
2000. U-Spatial. Political national boundaries as they were in 2000. Source: United States Central Intelligence Agency. (2000). Library of Congress. Retrieved May 3...
1991. Metro Data Resource Center. This polygon data layer represents hydric soils for Portland Metro, Oregon in 1991. The dataset was originally published by the Metro Data Resource...
1944, 1945, 1946, 1947, 1948, 1949, 1950, 1951, 1952, 1953, 1954, 1955, 1956, 1957, 1958, 1959, 1960, 1961, 1962, 1963, 1964, 1965, 1966, 1967, 1968, 1969, 1970, 1971, 1972, 1973, 1974, 1975, 1976, 1977, 1978, 1979, 1980, 1981, 1982, 1983, 1984, 1985, 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, and 1994. Wisconsin Department of Natural Resources. This polygon data layer represents hydrography for Milwaukee County, Wisconsin in 1944-1994. The dataset was originally published by the Wisconsin ...
2000. Legislative Technology Services Bureau. This polygon data layer represents hydrography for Milwaukee County, Wisconsin in 2000. The dataset was originally published by the Legislative Tec...
2000. Legislative Technology Services Bureau. This polygon data layer represents hydrography for Ozaukee County, Wisconsin in 2000. The dataset was originally published by the Legislative Techn...
2000. Legislative Technology Services Bureau. This polygon data layer represents hydrography polygons for Racine County, Wisconsin in 2000. The dataset was originally published by the Legislati...