@misc{indiciae33dc1efc5853,
  title = {Oil and gas wells drilled in southwestern Virginia before 1950},
  author = {J. W. Huddle and E. I. Jacobsen and A. D. Williamson},
  year = {1956},
  doi = {10.3133/b1027l},
  url = {https://pubs.usgs.gov/publication/b1027L},
  note = {Source identifier: b1027L}
}