@misc{indiciaef28cea673c9d,
  title = {The use of variable temperature and magic-angle sample spinning in studies of fulvic acids},
  author = {W.L. Earl and R.L. Wershaw and K. A. Thorn},
  year = {1987},
  doi = {10.1016/0022-2364(87)90337-4},
  url = {https://pubs.usgs.gov/publication/70014266},
  note = {Source identifier: 70014266}
}