@misc{indiciaebb84a3f81f01,
  title = {Trace element concentrations and bioindicator responses in tree swallows from northwestern Minnesota},
  author = {Christine M. Custer and T. W. Custer and D. Warburton and D. J. Hoffman and J. W. Bickham and C. W. Matson},
  year = {2006},
  doi = {10.1007/s10661-006-1499-1},
  url = {https://pubs.usgs.gov/publication/5224684},
  note = {Source identifier: 5224684}
}