@misc{indiciae28fdeff1c8ca,
  title = {Mercury and other element exposure to tree swallows (Tachycineta bicolor) nesting on Lostwood National Wildlife Refuge, North Dakota},
  author = {T. W. Custer and Christine M. Custer and K. M. Johnson and D. J. Hoffman},
  year = {2008},
  doi = {10.1016/j.envpol.2007.12.003},
  url = {https://pubs.usgs.gov/publication/70000131},
  note = {Source identifier: 70000131}
}