TY  - RPRT
TI  - Trends in metals in urban and reference lake sediments across the United States, 1970 to 2001
AU  - B.J. Mahler
AU  - P. C. Van Metre
AU  - E. Callender
PY  - 2006
DO  - 10.1897/05-459r.1
UR  - https://pubs.usgs.gov/publication/70028424
ID  - 70028424
ER  -