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| SECOND GEOLOGICAL SURVEY OF PENNSYLVANIA - REPORT OF PROGRESS P. DESCRIPTION OF THE COAL FLORA OF THE CARBONIFEROUS FORMATION IN PENNSYLVANIA AND THROUGHOUT THE UNITED STATES - VOL.III BY LEO LESQUEREUX; ©1884 |
Plates LXXXVIII through CXI and Their Captions: Scans and Webpage ©George Langford III, 2010 |
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