@misc{indiciae8e8557e7d5e9,
  title = {Natural cavities used by wood ducks in north-central Minnesota},
  author = {D.S. Gilmer and I.J. Ball and L.M. Cowardin and John E. Mathisen and John H. Riechmann},
  year = {1978},
  doi = {10.2307/3800266},
  url = {https://pubs.usgs.gov/publication/1001662},
  note = {Source identifier: 1001662}
}