Pennsylvanian tropical floras of the United States as a record of changing climate
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Pfefferkorn, H. W., Gastaldo, Robert A., DiMichele, William A., and Philips, T. L. 2008. "<a href="https://repository.si.edu/handle/10088/7171">Pennsylvanian tropical floras of the United States as a record of changing climate</a>." <em>Special Papers / Geological Society of America</em>, 441 305–316.