TY  - RPRT
TI  - Principal facts for gravity stations in Maryland, northern Virginia, southern Pennyslvania and the District of Columbia
AU  - D. L. Daniels
PY  - 1990
DO  - 10.3133/ofr90265
UR  - https://pubs.usgs.gov/publication/ofr90265
ID  - ofr90265
ER  -