Citation Data
MLA
Geological Survey (U.S.). West Union Quadrangle, Illinois--Indiana : 7.5 Minute Series (Topographic). [Reston, Va.] : Denver, Co. :The Survey ; For sale by the Survey, 2002.
APA
Geological Survey (U.S.). (2002). West Union quadrangle, Illinois--Indiana : 7.5 minute series (topographic) [Map]. [Reston, Va.] : Denver, Co. :The Survey ; For sale by the Survey,
Chicago
Geological Survey (U.S.). “West Union Quadrangle, Illinois--Indiana : 7.5 Minute Series (Topographic).” [Reston, Va.] : Denver, Co. :The Survey ; For sale by the Survey, 2002.
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