TY - RPRT TI - Principal facts for gravity stations in the Newark-Gettysburg Triassic Basin, Pennsylvania and adjacent states AU - John R. Sumner AU - R. F. Meyer AU - J.M. Dunleavy AU - R.S. Fleming PY - 1976 DO - 10.3133/ofr76302 UR - https://pubs.usgs.gov/publication/ofr76302 ID - ofr76302 ER -