@misc{indiciae7a55f5210553,
  title = {Mercury residues in pintails breeding in North Dakota},
  author = {Gary L. Krapu and G.A. Swanson and H.K. Nelson},
  year = {1973},
  doi = {10.2307/3800131},
  url = {https://pubs.usgs.gov/publication/1001287},
  note = {Source identifier: 1001287}
}