@misc{indiciae7f593deb3997,
  title = {Duck plague (duck virus enteritis) in wild waterfowl},
  author = {Milton Friend and Gary L. Pearson},
  year = {1973},
  doi = {10.3133/93791},
  url = {https://pubs.usgs.gov/publication/93791},
  note = {Source identifier: 93791}
}