@misc{indiciaea1b3f249b818,
  title = {Introduction and background},
  author = {R. Harris and David P. Krabbenhoft and M. Murray and R.J. Reash and T. Saltman and R. Murray},
  year = {2007},
  url = {https://pubs.usgs.gov/publication/70199334},
  note = {Source identifier: 70199334}
}