TY - RPRT TI - Principal facts for gravity stations in Hunterdon, Mercer, Monmouth, and Somerset counties, central New Jersey AU - K. R. Bond AU - D. L. Daniels PY - 1986 DO - 10.3133/ofr86294 UR - https://pubs.usgs.gov/publication/ofr86294 ID - ofr86294 ER -