TY - RPRT TI - Principal facts for gravity stations in Maricopa, Mojave, Yavapai, and Yuma Counties, Arizona AU - Jeffrey C. Wynn AU - James K. Otton AU - Ronald A. Stawicki PY - 1978 DO - 10.3133/ofr78207 UR - https://pubs.usgs.gov/publication/ofr78207 ID - ofr78207 ER -