@misc{indiciaefdd69fbcaacc,
  title = {Early concepts of the role of microorganisms in hydrogeology},
  author = {William Back},
  year = {2005},
  doi = {10.1111/j.1745-6584.1989.tb00474.x},
  url = {https://pubs.usgs.gov/publication/70015400},
  note = {Source identifier: 70015400}
}