Texas Instruments Incorporated. Aerial Radiometric and Magnetic Reconnaissance Survey of Portions of Arizona--New Mexico: Volume 2-C, Tucson Quadrangle, report, November 1978; (https://digital.library.unt.edu/ark:/67531/metadc784512/m1/1/: accessed April 20, 2019), University of North Texas Libraries, Digital Library, digital.library.unt.edu; .