@misc{indiciae23aa9e7df2c7,
  title = {Evaluation of aerial transect surveys for wintering American black ducks},
  author = {Michael J. Conroy and James R. Goldsberry and James E. Hines and Daniel B. Stotts},
  year = {1988},
  doi = {10.2307/3800933},
  url = {https://pubs.usgs.gov/publication/5220013},
  note = {Source identifier: 5220013}
}