[en] Instrumentation and methods are described that were used for a Department of Energy (DOE) sponsored, high-sensitivity, aerial gamma-ray spectrometer and magnetometer survey of the Mesa, Tucson, Nogales, Clifton, Silver City, and Douglas, NTMS, 1:250,000-scale quadrangles in southeastern Arizona and southwestern New Mexico. A Bell 212 helicopter equipped with gamma-ray spectrometer and six large-volume sodium iodide (NaI) detectors, two 400-channel analyzers, and ancillary geophysical and electronic equipment was employed for the major part of the 1978 coverage. A DC-3 aircraft equipped with nine detectors was used for parts of two quadrangles. The systems were calibrated using the DOE calibration facilities at Grand Junction, Colorado, and Lake Mead, Arizona. Gamma-ray spectrometric data were processed to correct for variations in atmospheric, flight, and instrument conditions and were statistically evaluated to remove the effects of surface geologic variations. The resulting first-priority uranium anomalies were interpreted to evaluate their origin and significance. Results of the interpretation in the form of a preferred anomaly map, along with significance-factor profile maps, stacked profiles, and histograms, ard presented in the individual quadrangle volumes of this final report