Manuscript entitled, Fossil Flora and Fauna of the Pennsylvanian Period, Will County, Illinois
by George Langford (1876-1964)
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Trigonocarpus, page 79. 
Sarcotesta
Trigonocarpus mesotesta, GL photograph page 79
Sarcotesta
Trigonocarpus sarcotesta, GL photograph, page 79
Nucellus
Trigonocarpus nucellus, GL photograph, page 79
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Sclerotesta
Trigonocarpus sclerotesta, GL photograph, page 79
Trigonocarpus
Trigonocarpus, GL sketch, page 79
Mesotesta
Trigonocarpus mesotesta, GL photograph, page 79
Note: the scan of the original page 79 is here. The original page was letter size but the image may have been cropped slightly.