@misc{indiciae96c649f2ff74,
  title = {Air pollution effects on growth of ponderosa pine, jeffrey pine, and bigcone douglas-fir},
  author = {M. Arbaugh and D. L. Peterson and P.R. Miller},
  year = {1999},
  doi = {10.1007/978-1-4612-1436-6\_9},
  url = {https://pubs.usgs.gov/publication/70194585},
  note = {Source identifier: 70194585}
}