@misc{indiciae476395dc592f,
  title = {Engelmann Spruce (Picea engelmannii) as a biological monitor of changes in soil metal loading related to past mining activity},
  author = {K.M. Witte and R. B. Wanty and W.I. Ridley},
  year = {2004},
  doi = {10.1016/j.apgeochem.2004.01.022},
  url = {https://pubs.usgs.gov/publication/70026705},
  note = {Source identifier: 70026705}
}