@misc{indiciae42dfd8ce5bd2,
  title = {Mallard use of nesting islands depends on surrounding upland cover},
  author = {T.L. Shaffer and A. Dahl and M. Johnson and R. Reynolds and K. Baer and G.A. Sargeant},
  year = {1999},
  url = {https://pubs.usgs.gov/publication/93881},
  note = {Source identifier: 93881}
}