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Billingsley, George H.
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U.S. Geological Survey ;
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Arizona
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1. Geologic map of the Cameron 30ʹ x 60ʹ quadrangle, Coconino County, northern Arizona
Billingsley, George H. U.S. Geological Survey ;.
2. Geologic map of the Fredonia 30ʹ x 60ʹ quadrangle, Coconino and Mohave Counties, northern Arizona
Billingsley, George H. U.S. Geological Survey ;.