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| Author | : | Böse, E. |
| Year of publication | : | 1921 |
| Reference letter | : | a |
| Title | : | On the Permian of Coahuila, northern Mexico. |
| Journal | : | American Journal of Science |
| Vol/No/Pages/Plates | : | 201: 187-194 |
| Published in | : | New Haven, Connecticut |