2006. National Atlas of the United States. This polygon shapefile shows Indian lands of the United States. Only areas of 640 acres or more are included. Federally-administered lands within a... National Atlas of the United States.
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"Base compiled by U.S. Geological Survey for map on scale of 1:1,000,000 with additional information obtained by Herbert E. Gregory in 1908-1913." ... U.S. Geological Survey.
Gregory, Herbert E. (Herbert Ernest), 1869-1952 and Pogue, Joseph E. (Joseph Ezekiel), 1887-1971. Base compiled by U.S. Geological Survey for map on scale 1:1,000,000 with additional information obtained by Herbert E. Gregory in 1908-1913 ; Geol... U.S. Geological Survey.