@misc{indiciaed4ab5c8dd9a8,
  title = {Stratigraphy and geologic map of Tertiary coal-bearing deposits, Shirak region, northwestern Armenia},
  author = {Todd A. Dallegge and Artur Martirosyan and Florian Maldonado and B.S. Pierce},
  year = {1999},
  doi = {10.3133/ofr00159},
  url = {https://pubs.usgs.gov/publication/ofr00159},
  note = {Source identifier: ofr00159}
}