Exploratory drilling in the Prairie du Chien group of the Wisconsin zinc-lead district by the U.S. Geological Survey in 1949-1950
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Main Author: | Heyl, Allen V. 1918-2008. |
---|---|
Format: | Book |
Language: | English |
Published: |
[Washington],
[publisher not identified],
1951.
|
Physical Description: |
i, 35 pages : illustrations, maps. ; 27 cm. |
Series: |
Geological Survey circular ;
131. |
Subjects: |
In Prospector
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