@misc{indiciae4926ba0feb40,
  title = {Factors influencing waterfowl counts on aerial surveys, 1961-66},
  author = {R. Kahler Martinson and Charles F. Kaczynski},
  year = {1967},
  url = {https://pubs.usgs.gov/publication/ssrw105},
  note = {Source identifier: ssrw105}
}