@misc{indiciae7052211a80bf,
  title = {Contributions to economic geology, 1909, part II, mineral fuels--Petroleum and natural gas},
  author = {A.G. Leonard and H. E. Gregory and Chester Wesley Washburne and Robert Anderson},
  year = {1911},
  doi = {10.3133/b431a},
  url = {https://pubs.usgs.gov/publication/b431A},
  note = {Source identifier: b431A}
}