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1995. U.S. Geological Survey. GeoJSON index map of polygons, but lacking a downloadUrl for the index itself. This is an index of all the available DEM (digital elevation model)... U.S. Geological Survey.
1995. U.S. Geological Survey. GeoJSON index map of polygons, with a downloadUrl for the index itself. This is an index of all the available DEM (digital elevation model) tiles ... U.S. Geological Survey.

3. Millionth Map of Hispanic America

Maps American Geographical Society Library - UWM Libraries Public content
1922, 1924, 1927, 1928, 1929, 1930, 1931, 1932, 1933, 1934, 1935, 1936, 1937, 1938, 1939, 1940, 1941, 1942, 1943, 1945, 1947, 1948, 1949, 1950, 1951, 1952, 1955, 1956, 1958, 1959, 1960, and 1962. American Geographical Society of New York. GeoJSON index map of polygons using the OpenIndexMaps 1.0 schema. Complex geometry including inset maps (Multipolygon) and multiple editions of som... American Geographical Society of New York.