@misc{indiciae576e175e395e,
  title = {Principal areas of oil, natural gas, and coal production in the northern part of the Front Range, Colorado},
  author = {Neil S. Fishman and Stephen B. Roberts and John M. Evans and Robert J. Olmstead},
  year = {2005},
  doi = {10.3133/i2750b},
  url = {https://pubs.usgs.gov/publication/i2750B},
  note = {Source identifier: i2750B}
}