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Sardeson F.W. (1902). The Carboniferous formations of Humboldt, Iowa. American Geologist. 30: 300-312.
481131
Sardeson F.W.
1902
The Carboniferous formations of Humboldt, Iowa
American Geologist
30: 300-312
Publication
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Loxonema difficile Sardeson, 1902 † accepted as Palaeozygopleura difficile (Sardeson, 1902) † (original description)