TY - RPRT TI - Aeromagnetic map of the Vulcan area, San Bernardino County, California AU - Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey PY - 1988 DO - 10.3133/ofr88506 UR - https://pubs.usgs.gov/publication/ofr88506 ID - ofr88506 ER -