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_aDarrah, William C. _931096 |
| 245 | _aStudies of American coal balls | ||
| 500 | _aEncuadernado con varios sobretiros | ||
| 500 | _aSobretiro de : Am. J. Sci. 239(1): 33-53, 1941 | ||
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_aPaleobotánica. _984896 |
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