@misc{indiciaed60452e2404a,
  title = {Temporal and spatial variations in fly ash quality},
  author = {J.C. Hower and A.S. Trimble and C.F. Eble},
  year = {2001},
  doi = {10.1016/s0378-3820(01)00193-x},
  url = {https://pubs.usgs.gov/publication/70023083},
  note = {Source identifier: 70023083}
}