Ponce, D.A., 1990, Geophysics - Gravity and magnetic methods, in Peterson, J.A., ed., Preliminary mineral resource assessment of the Tucson and Nogales 1o by 2o quadrangles, Arizona: U.S. Geological Survey Open-File Report 90-0276, p. 41-56.
Ponce, D.A., 1990, Geophysics - Gravity and magnetic methods, in Peterson, J.A., ed., Preliminary mineral resource assessment of the Tucson and Nogales 1o by 2o quadrangles, Arizona: U.S. Geological Survey Open-File Report 90-0276, p. 41-56.
Bibliography, Gravity Survey, Magnetic Survey,