TY - RPRT TI - Aeromagnetic map of parts of the Piney River and Shipman quadrangles, Amherst and Nelson Counties, Virginia AU - Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey PY - 1969 DO - 10.3133/ofr69293 UR - https://pubs.usgs.gov/publication/ofr69293 ID - ofr69293 ER -