TY  - RPRT
TI  - The U. S. Geological Survey's gravity program in Washington, Idaho, Montana, and Wyoming
AU  - D.P. Hill
PY  - 2014
DO  - 10.1029/tr046i001p00214
UR  - https://pubs.usgs.gov/publication/70221196
ID  - 70221196
ER  -