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Geologic map of the Waterman Peak 7.5' quadrangle and northern La Tortuga Butte 7.5' quadrangle, Pima county, Arizona Report
Stephen M. Richard, Geologic map of the Waterman Peak 7.5' quadrangle and northern La Tortuga Butte 7.5' quadrangle, Pima county, Arizona Report. Arizona Memory Project, accessed 28/09/2023, https://azmemory.azlibrary.gov/nodes/view/129374