@misc{indiciaec19baee8ce16,
  title = {Migration of birds in North Dakota during fall 1971},
  author = {Douglas H. Johnson and J. T. Lokemoen and P. F. Springer},
  year = {1972},
  url = {https://pubs.usgs.gov/publication/1001546},
  note = {Source identifier: 1001546}
}