@misc{indiciae1c77de404456,
  title = {Waterfowl utilization and hunting kill 1946 through 1960, Upper Mississippi River Wildlife and Fish Refuge and Mark Twain National Wildlife Refuge},
  author = {William E. Green},
  year = {1963},
  url = {https://pubs.usgs.gov/publication/ssrw71},
  note = {Source identifier: ssrw71}
}