| Title: | On the Age of the Lignitic Formations of the Rocky Mountains |
| Author: | Lesquereux, Leo, 1806-1889 |
| Note: | extract from the American Journal of Science and Arts, 1874 |
| Link: | page images at HathiTrust |
| Stable link here: | https://onlinebooks.library.upenn.edu/webbin/book/lookupid?key=olbp81341 |
| Subject: | Plants, Fossil -- Colorado |
| Subject: | Paleobotany -- Carboniferous |
| Subject: | Paleobotany -- Colorado |
| Subject: | Paleontology -- Carboniferous |
| Other copies: | Look for editions of this book at your library, or elsewhere. |
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