TY  - RPRT
TI  - Geochemical data for Colorado soils: Results from the 2006 state-scale geochemical survey
AU  - David B. Smith
AU  - Karl J. Ellefsen
AU  - James E. Kilburn
PY  - 2010
DO  - 10.3133/ds520
UR  - https://pubs.usgs.gov/publication/ds520
ID  - ds520
ER  -