TY - RPRT TI - Principal facts for 1040 gravity stations in the Gillette and Sheridan 1x2 degree quadrangles, and Crow Indian Reservation, Wyoming, Montana, and South Dakota AU - Courteney Williamson AU - S. L. Robbins PY - 1991 DO - 10.3133/ofr91287 UR - https://pubs.usgs.gov/publication/ofr91287 ID - ofr91287 ER -