Manuscript entitled, Fossil Flora and Fauna of the Pennsylvanian Period, Will County, Illinois
by George Langford (1876-1964)
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Pecopterid pinnules, pages 49 - 50.
Pecopterid pinnules - sketches by GL on page 49.
Arrangements of pinnules - copied from Brongniart by GL, page 50.
Pecopterid pinnules - Sketch by George Langford
Sketches copied  from Brongniart