@misc{indiciaee7e2baefeb46,
  title = {Changing levels of heavy metal accumulation in birds at Tumacacori National Historic Park along the Upper Santa Cruz River Watershed in southern Arizona},
  author = {Charles van Riper and Michael B. Lester},
  year = {2016},
  url = {https://pubs.usgs.gov/publication/70171079},
  note = {Source identifier: 70171079}
}