@misc{indiciae6d44e9fbdac3,
  title = {Techniques and results of nongame bird monitoring in North America},
  author = {C.S. Robbins and D. Bystrak and P.H. Geissler},
  year = {1980},
  url = {https://pubs.usgs.gov/publication/5210239},
  note = {Source identifier: 5210239}
}