Reports and maps of the Geological Survey released only in the open files, 1970 / by Betsy A. Weld, Margaret S. Griffin, and George W. Brett.
| Uniform Title: | Geological Survey circular ;
638. |
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| Language: | English |
| Published: |
Washington :
U.S. Dept. of the Interior, Geological Survey,
1971.
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| Series: | Geological Survey circular ;
638. |
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| Online Access: | |
| Physical Description: | 23 pages : DJVU, image file. |
| Format: | Government Document Electronic eBook |