Geological map of Pre-Cambrian formations of the Gwinn iron bearing district of Michigan : based on records of drill holes by the Cleveland Cliffs Iron Company and the Oliver Iron Mining Co. and field mapping by R.C. Allen, 1913 /
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| Author / Creator: | Allen, R. C. (Rolland Craten), 1881-1948. |
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| Imprint: | [Cleveland, Ohio] : Cleveland Cliffs Iron Co., [1913?] |
| Description: | 1 map ; 61 x 45 cm. |
| Language: | English |
| Subject: | |
| Cartographic data: | Scale [ca. 1:16,000]. |
| Format: | Map Print |
| URL for this record: | http://pi.lib.uchicago.edu/1001/cat/bib/7715433 |