TY - RPRT TI - Principal facts for gravity stations in the Challis, Idaho, 1 x 2 degree quadrangle AU - Michael Webring AU - D. R. Mabey PY - 1981 DO - 10.3133/ofr81652 UR - https://pubs.usgs.gov/publication/ofr81652 ID - ofr81652 ER -