@misc{indiciae0a7d5b5bcc69,
  title = {Assessment of soil calcium status in red spruce forests in the northeastern United States},
  author = {G.B. Lawrence and M.B. David and S.W. Bailey and W.C. Shortle},
  year = {1997},
  doi = {10.1023/a:1005790130253},
  url = {https://pubs.usgs.gov/publication/70020046},
  note = {Source identifier: 70020046}
}