@misc{indiciaecfd54db068ea,
  title = {Contributions to economic geology, 1905 : Petroleum and Natural Gas},
  author = {Ralph Arnold and F.G. Clapp},
  year = {1906},
  doi = {10.3133/b285g},
  url = {https://pubs.usgs.gov/publication/b285G},
  note = {Source identifier: b285G}
}