TY - RPRT TI - U.S. Geological Survey potential-field geophysical software, version 2.0: Install, help, plot, contour and test data diskette AU - Lindrith E. Cordell AU - Jeffrey D. Phillips AU - Richard H. Godson PY - 1992 DO - 10.3133/ofr9218b UR - https://pubs.usgs.gov/publication/ofr9218B ID - ofr9218B ER -