@misc{indiciaef29a641d47a9,
  title = {Colonial birds nesting on man-made and natural sites in the U.S. Great Lakes},
  author = {William C. Scharf},
  year = {1978},
  url = {https://pubs.usgs.gov/publication/fwsobs78\_15},
  note = {Source identifier: fwsobs78\_15}
}