TY  - RPRT
TI  - Principal facts for gravity profiles at Orrington and Waterville, Maine
AU  - Robert W. Simpson
AU  - Paul LaPierre
PY  - 1978
DO  - 10.3133/ofr78849
UR  - https://pubs.usgs.gov/publication/ofr78849
ID  - ofr78849
ER  -