TY - RPRT TI - Bouguer and isostatic residual gravity maps of the Colorado River region, including the Kingman, Needles, Salton Sea, and El Centro quadrangles AU - John Mariano AU - M.G. Helferty AU - T. B. Gage PY - 1986 DO - 10.3133/ofr86347 UR - https://pubs.usgs.gov/publication/ofr86347 ID - ofr86347 ER -