@misc{indiciae79c4d28c5eb4,
  title = {Bird hazard to aircraft},
  author = {J.W. Aldrich and C.S. Robbins and W.W. Dykstra},
  year = {1961},
  url = {https://pubs.usgs.gov/publication/5230106},
  note = {Source identifier: 5230106}
}