@misc{indiciae55e1ed719e04,
  title = {Long-term monitoring of ozone injury to Jeffrey and Ponderosa Pines in Sequoia and Kings Canyon National Parks},
  author = {D. M. Ewell and D. T. Gay},
  year = {1993},
  url = {https://pubs.usgs.gov/publication/70128751},
  note = {Source identifier: 70128751}
}