TY  - RPRT
TI  - Methodology for construction of a three-layer geologic model of the conterminous United States using land surface, top of bedrock, and top of basement
AU  - Donald S. Sweetkind
PY  - 2026
DO  - 10.3133/dr1220
UR  - https://pubs.usgs.gov/publication/dr1220
ID  - dr1220
ER  -