Gregory, Herbert Ernest
[Other]
;
United States Congress House,
United States Geological Survey
Geology of the Navajo country. A reconnaissance of parts of Arizona, New Mexico, and Utah by Herbert E. Gregory. [U.S. Geological Survey Professional Paper 93.]
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Geology of the Navajo country. A reconnaissance of parts of Arizona, New Mexico, and Utah by Herbert E. Gregory. [U.S. Geological Survey Professional Paper 93.]