@misc{indiciaea58789800b80,
  title = {Effects of air pollutants on cold-desert cyanobacterial lichen crusts and rock lichens: chlorophyll degradation, electrolyte leakage, and nitrogenase activity},
  author = {J. Belnap},
  year = {1990},
  url = {https://pubs.usgs.gov/publication/70123839},
  note = {Source identifier: 70123839}
}