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Illinois

APA Citation

Geological Survey (U.S.). (1999). Illinois. [Reston, Va.?]: [U.S. Dept. of the Interior, U.S. Geological Survey].

Geological Survey (U.S.). Illinois. [Reston, Va.?]: [U.S. Dept. of the Interior, U.S. Geological Survey], 1999.

Warning: These citations may not always be complete (especially for serials).