Zinc-lead-copper resources and general geology of the upper Mississippi Valley district /
Heyl, A. V.(Allen Van),1918-
Washington, [D.C.] : U.S. G.P.O.,
1955.
Two folded maps in pocket.
"Prepared in cooperation with the Wisconsin Geological and Natural History Survey, the Illinois State Geological Survey, and the Iowa Geological Survey.
Information on Illinois furnished by H. B. Willman and R. R. Reynolds.
Includes index.
Geology
Zinc mines and mining
Lead mines and mining
Copper mines and mining