@misc{indiciae817a91146ff1,
  title = {Status of soil acidification in North America},
  author = {M.E. Fenn and T.G. Huntington and S.B. Mclaughlin and C. Eagar and A. Gomez and R.B. Cook},
  year = {2006},
  url = {https://pubs.usgs.gov/publication/70030306},
  note = {Source identifier: 70030306}
}