Manuscript entitled, Fossil Flora and Fauna of the Pennsylvanian Period, Will County, Illinois
by George Langford (1876-1964)
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The six ages of prehistoric life, pp 4-5.
GL's handwritten notes about the six ages of prehistoric life, page 4.
 GL's chart of the six ages of prehistoric life, page 5.
The six ages of prehistoric life, page 4, GL's handwritten notes.
 GL's hand-drawn chart of the six ages of prehistoric life, page 5