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 |
"Fossil Flora and Fauna of
the Pennsylvanian Period, Will County, Illinois" by George Langford (1876-1964) |
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Leo Lesquereux, Vol.III, Plate XCI, No.6.
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George Langford, Sr.: page 25. |
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