Manuscript entitled, Fossil Flora and Fauna of the Pennsylvanian Period, Will County, Illinois
by George Langford (1876-1964)
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Calamites cruciatus and Calamites approximatus, page 19.
Calamites cruciatus text, GL handwritten
Calamites approximatus, GL handwritten text, page 19
Calamites undulatus, GL photograph.
Sketch, Fig. 1a.
GL photograph, Fig. 1.
Calamites cruciatus sketch by GL
Calamites cruciatus, page 19

Note: the
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Calamites approximatus, GL sketch, page 19
Calamites undulatus, GL photograph, page 19