TY  - RPRT
TI  - Isostatic residual gravity, topographic, and first-vertical derivative gravity maps of the conterminous United States
AU  - R.W. Simpson
AU  - R.C. Jachens
AU  - R. W. Saltus
AU  - R.J. Blakely
PY  - 1986
DO  - 10.3133/gp975
UR  - https://pubs.usgs.gov/publication/gp975
ID  - gp975
ER  -