Search for all of "Geologic", all of "Longwell Chester R chester Ray 1887-1975", all of "Geology -- Arizona -- Grand Wash Cliffs -- Maps"

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Geologic map and sections of Muddy Mountains, St. Thomas Gap, and part of the Grand... 'Geology by C.R. Longwell.' At top of map: 'U.S. Geological Survey Bulletin 798, plate 1.' Includes four colored cross-sections.
 

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