@misc{indiciaec0b3e5734826,
  title = {Geochemistry of natural gas manifestions from the Upper Tiber Valley (central Italy)},
  author = {O. Vaselli and F. Tassi and A. Minissale and B. Capaccioni and G. Macro and William C. Evans},
  year = {1997},
  url = {https://pubs.usgs.gov/publication/70019525},
  note = {Source identifier: 70019525}
}