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Northern Expedition, 1926-1928
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Poweshiek County (Iowa)
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Mazon Creek, Grundy Co., Ill., Coal Measures
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(1 - 4 of 4)
Title
Neuropteris
PID
grinnell:17028
Title
Neuropteris
PID
grinnell:17029
Title
Pecopteris
PID
grinnell:17049
Title
Pecopteris
PID
grinnell:17048