@misc{indiciaec0c7a45798c6,
  title = {Stump and tree nesting by mallards and black ducks},
  author = {Lewis M. Cowardin and G.E. Cummings and P.B. Reed},
  year = {1967},
  doi = {10.2307/3798311},
  url = {https://pubs.usgs.gov/publication/1001416},
  note = {Source identifier: 1001416}
}