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)
Sphenophyllum longifolium, Plate XCI, No.6
 Sphenophyllum longifolium. Shown at approximately the same size as in George Langford, Sr.'s photograph and half the size of the 2/1 sketch at right.
Leo Lesquereux, Vol.III, Plate XCI, No.6.
Sphenophyllum longifolium, Langford page 25
 Sphenophyllum longifolium.

Photograph of collected fossil (left) and sketch of vein structure (below)

Sphenophyllum longifolium, Langford, page 25

George Langford, Sr.: page 25.
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