@misc{indiciae8f61309bbbee,
  title = {Factors affecting waterfowl breeding density and productivity estimates in the Northeast},
  author = {J. R. Longcore and J.K. Ringelman},
  year = {1980},
  url = {https://pubs.usgs.gov/publication/5221583},
  note = {Source identifier: 5221583}
}