Reston, Virginia : U.S. Department of the Interior, U.S. Geological Survey, 2000
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Map
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Full Title:
Altitude, depth, and thickness of the Galena-Platteville bedrock unit in the subcrop area of Illinois and Wisconsin / by Timothy A. Brown, Charles P. Dunning, and Jennifer B. Sharpe
Title from title screen (viewed Feb. 29, 2016). Also available online in PDF format from the U.S. Geological Survey Warehouse (http://pubs.er.usgs.gov/). Relief shown by contours and gradient tints. Includes location map. Prepared in cooperation with the U.S. Environmental Protection Agency.