TY  - RPRT
TI  - Trace element concentrations and bioindicator responses in tree swallows from northwestern Minnesota
AU  - Christine M. Custer
AU  - T. W. Custer
AU  - D. Warburton
AU  - D. J. Hoffman
AU  - J. W. Bickham
AU  - C. W. Matson
PY  - 2006
DO  - 10.1007/s10661-006-1499-1
UR  - https://pubs.usgs.gov/publication/5224684
ID  - 5224684
ER  -