@misc{indiciaec9a3fd2ba52a,
  title = {A manual for the installation of bench marks on active volcanoes},
  author = {M.P. Doukas},
  year = {1993},
  doi = {10.3133/ofr93176a},
  url = {https://pubs.usgs.gov/publication/ofr93176A},
  note = {Source identifier: ofr93176A}
}