@misc{indiciae17996ef0bbd9,
  title = {Mallard recruitment in the agricultural environment of North Dakota},
  author = {L.M. Cowardin and D.S. Gilmer and Charles W. Shaiffer},
  year = {1985},
  url = {https://pubs.usgs.gov/publication/1001412},
  note = {Source identifier: 1001412}
}