TY  - RPRT
TI  - Digital colored Bouguer gravity, free-air gravity, station location, and terrain maps for the conterminous United States
AU  - R.W. Simpson
AU  - T.G. Hildenbrand
AU  - R. H. Godson
AU  - M. F. Kane
PY  - 1987
DO  - 10.3133/gp953b
UR  - https://pubs.usgs.gov/publication/gp953B
ID  - gp953B
ER  -