The geology of the upper Mississippi Valley zinc-lead distict,
Heyl, Allen Van, 1918-
The geology of the upper Mississippi Valley zinc-lead distict, by Allen V. Heyl, Jr. [and others] With special sections by Arthur E. Flint. Prepared in cooperation with the Wisconsin Geological and Natural History Survey, the Iowa Geological Survey, and the Illinois State Geological Survey. - Washington, U.S. Govt. Print. Off., 1959. - x, 310 p. illus., maps (24 fold. 22 col., in portfolio) diagrs., profiles, tables. 29 cm.
Bibliography: p. 296-303.
gs 59000160
Geology--Mississippi River Valley.
Zinc mines and mining--Mississippi River Valley.
QE75 / .P9 no. 309
557.7
I 19.16:309/
The geology of the upper Mississippi Valley zinc-lead distict, by Allen V. Heyl, Jr. [and others] With special sections by Arthur E. Flint. Prepared in cooperation with the Wisconsin Geological and Natural History Survey, the Iowa Geological Survey, and the Illinois State Geological Survey. - Washington, U.S. Govt. Print. Off., 1959. - x, 310 p. illus., maps (24 fold. 22 col., in portfolio) diagrs., profiles, tables. 29 cm.
Bibliography: p. 296-303.
gs 59000160
Geology--Mississippi River Valley.
Zinc mines and mining--Mississippi River Valley.
QE75 / .P9 no. 309
557.7
I 19.16:309/