TY - RPRT TI - Aeromagnetic map of part of the Bismark 1° by 2° quadrangle, North Dakota AU - Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey PY - 1981 DO - 10.3133/ofr81433 UR - https://pubs.usgs.gov/publication/ofr81433 ID - ofr81433 ER -