Tentative correlation of the named geologic units of Colorado.
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| Author / Creator: | Wilmarth, M. Grace (Mary Grace), 1866-1949. |
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| Imprint: | [Washington] : U.S. Geological Survey, 1931. |
| Description: | 3 charts ; on sheets 91 x 76 cm. |
| Language: | English |
| Subject: | |
| Format: | Map U.S. Federal Government Document Print |
| URL for this record: | http://pi.lib.uchicago.edu/1001/cat/bib/3873551 |