TY  - RPRT
TI  - Principal facts for gravity profiles near South Penobscot, Maine
AU  - Robert W. Simpson
AU  - Paul LaPierre
PY  - 1979
DO  - 10.3133/ofr79767
UR  - https://pubs.usgs.gov/publication/ofr79767
ID  - ofr79767
ER  -