@misc{indiciaecf3908e55163,
  title = {Dieldrin and DDT: Effects on sparrow hawk eggshells and reproduction},
  author = {Richard D. Porter and Stanley N. Wiemeyer},
  year = {1969},
  doi = {10.1126/science.165.3889.199},
  url = {https://pubs.usgs.gov/publication/5221259},
  note = {Source identifier: 5221259}
}