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In 1938-39 the Illinois State Planning Commission issued a series of 8 reports on major Illinois river basins to the Governor of Illinois, Henry Horner. These reports were based on a standard outline from the Drainage Basin Study of the National Resources Committee, and include basic descriptions of the river and its tributaries, human occupancy and use, water development and hydrography flood control, groundwater, pollution, and the future development plans and needs. All 8 reports were digitized through Google Books, and are freely available from the HathiTrust Digital Library.
National Resources Committee Summary Reports
More information about the National Resources Committee (succeeded by the National Resources Planning Board in 1939) and its activities can be found in their annual Summary Reports to the president from this time period.
Example of a letter of transmittal included in the reports; this one from the Kaskaskia River Basin Report:
Digitized river reports in HathiTrust (listed alphabetically by river name)