@misc{indiciae0116fb2d8a5f,
  title = {Chapter A7 Biological Indicators},
  author = {Donna N. Myers and Franceska D. Wilde},
  year = {2008},
  doi = {10.3133/twri09a7},
  url = {https://pubs.usgs.gov/publication/twri09A7},
  note = {Source identifier: twri09A7}
}