Bisdorf, R.J., 1990, Geophysics - Electrical and seismic 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. 65-67.
Bisdorf, R.J., 1990, Geophysics - Electrical and seismic 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. 65-67.
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