SECOND GEOLOGICAL SURVEY OF PENNSYLVANIA - REPORT OF PROGRESS
P. ATLAS TO THE COAL FLORA OF PENNSYLVANIA
AND OF THE
CARBONIFEROUS FORMATION THROUGHOUT THE UNITED STATES
BY LEO LESQUEREUX; ©1879
87 Plates and Their Captions:
Scans and Webpage
©George Langford III, 2010
Plate VI
Neuropteris gibbosa, Plate VI