@misc{indiciaebd0de5228483,
  title = {California's Central Valley wintering waterfowl: Concerns and challenges},
  author = {David S. Gilmer and Michael R. Miller and Richard D. Bauer and John R. LeDonne},
  year = {1982},
  url = {https://pubs.usgs.gov/publication/70230870},
  note = {Source identifier: 70230870}
}