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Newell, N. D.; Kummel, B. (1942). Lower Eo-Triassic stratigraphy, western Wyoming and southeast Idaho. Geological Society of America Bulletin. 53(6): 937-996.
Newell, N. D.; Kummel, B. (1942). Lower Eo-Triassic stratigraphy, western Wyoming and southeast Idaho. Geological Society of America Bulletin. 53(6): 937-996.