@misc{indiciae938d27538f6e,
  title = {Incidence of black-phase plumage in ferruginous hawks nesting in central North Dakota},
  author = {P.M. Konrad and D.S. Gilmer},
  year = {1988},
  url = {https://pubs.usgs.gov/publication/1001654},
  note = {Source identifier: 1001654}
}