Clay / by Paul M. Tyler.
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| Main Author: | |
|---|---|
| Format: | Government Document Book |
| Language: | English |
| Published: |
[Washington, D.C.] :
U.S. Dept. of the Interior, Bureau of Mines,
1929.
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| Series: | Information circular (United States. Bureau of Mines) ;
6155. |
| Subjects: |