TY  - RPRT
TI  - Geochemical landscapes of the conterminous United States — New map presentations for 22 elements
AU  - N. Gustavsson
AU  - B. Bolviken
AU  - D. B. Smith
AU  - R. C. Severson
PY  - 2001
DO  - 10.3133/pp1648
UR  - https://pubs.usgs.gov/publication/pp1648
ID  - pp1648
ER  -