@misc{indiciae978be9cd4f9c,
  title = {Molt and aging criteria for four North American grassland passerines},
  author = {Peter Pyle and Stephanie L. Jones and Janet M. Ruth},
  year = {2008},
  url = {https://pubs.usgs.gov/publication/70176803},
  note = {Source identifier: 70176803}
}