[Plats of Indian grants and reserves in Ohio and Michigan]. 1820-1833.
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United States. Surveyor General
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Federal land surveys in Illinois were authorized by Congressional act (March 26, 1804), when the U. S. Surveyor General was given jurisdiction over all public land north of the Ohio and east of the Mississippi Rivers. Surveys began in the western Vincennes Tract (1804) and southern Illinois (1806), then proceeded northward; covering all but most northern Illinois by 1831. When the Illinois surveys began, the Surveyor General was an independent officer under the President's direct su...