@misc{indiciaed05447da3edd,
  title = {Toxicity of Mount St. Helens ash leachate to a blue-green alga},
  author = {Diane M. McKnight and Gerald L. Feder and Eric A. Stiles},
  year = {1981},
  doi = {10.3133/cir850f},
  url = {https://pubs.usgs.gov/publication/cir850F},
  note = {Source identifier: cir850F}
}