TY  - RPRT
TI  - Monitoring soil geochemistry in the urban environment: A comparison of studies in 1972 and 2005 in Denver, Colorado
AU  - David B. Smith
AU  - Karl J. Ellefsen
AU  - Ronald G. Garrett
AU  - L. Graham Closs
PY  - 2011
UR  - https://pubs.usgs.gov/publication/70044955
ID  - 70044955
ER  -