@misc{indiciae68b01e86fd67,
  title = {Assessing mine drainage pH from the color and spectral reflectance of chemical precipitates},
  author = {D.J. Williams and J.M. Bigham and C.A. Cravotta and S.J. Traina and J.E. Anderson and J.G. Lyon},
  year = {2002},
  doi = {10.1016/s0883-2927(02)00019-7},
  url = {https://pubs.usgs.gov/publication/70024424},
  note = {Source identifier: 70024424}
}