@misc{indiciaef9671744f6c3,
  title = {Soil-calcium depletion linked to acid rain and forest growth in the eastern United States},
  author = {Gregory B. Lawrence and T.G. Huntington},
  year = {1999},
  doi = {10.3133/wri984267},
  url = {https://pubs.usgs.gov/publication/wri984267},
  note = {Source identifier: wri984267}
}