@misc{indiciae6bb01566e0cb,
  title = {Aerial surveys of waterbirds in Alaska 1957-94 : population trends and observer variability},
  author = {J.I. Hodges and J.G. King and B. Conant and H.A. Hanson},
  year = {1996},
  url = {https://pubs.usgs.gov/publication/itr4},
  note = {Source identifier: itr4}
}