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|Material Type:||Government publication, State or province government publication|
|All Authors / Contributors:||
Richard C Berg; John P Kempton; Illinois State Geological Survey.; Northern Illinois University. Laboratory for Cartography and Spatial Analysis.
|Notes:||"Map prepared by Northern Illinois University Laboratory for Cartography and Spatial Analysis. Original map drafted by Craig Ronto, ISGS."
"This map appears (in black and white) as Plate 1 in ISGS Circular 532, which contains complete descriptions of geologic units and materials."
"U.S. Geological Survey base map."
|Description:||1 map : color ; 124 x 72 cm|
|Cartographic Mathematical Data:||Scale 1:500,000. 1 in. equals approx. 8 mi. ;; Lambert conformal conic projection based on standard parallels 33Â° and 45Â°; (W 92Â°--W 87Â°/N 43Â°--N 36Â°).|
|Responsibility:||by Richard C. Berg, John P. Kempton ; with contributions by Robert G. Vaiden, Amy N. Stecyk.|