TY  - RPRT
TI  - Geochemical studies of North American soils: results from the pilot study phase of the North American Soil Geochemical Landscapes Project
AU  - David B. Smith
PY  - 2009
DO  - 10.1016/j.apgeochem.2009.04.006
UR  - https://pubs.usgs.gov/publication/70140566
ID  - 70140566
ER  -