@misc{indiciaedf92d344357d,
  title = {Waterfowl and their wintering grounds in Mexico, 1937-64},
  author = {George B. Saunders and Dorothy Chapman Saunders},
  year = {1981},
  url = {https://pubs.usgs.gov/publication/rp138},
  note = {Source identifier: rp138}
}