@misc{indiciae4e570ee5bc5e,
  title = {Contributions to economic geology, 1910, Part II, Mineral fuels--Miscellaneous analyses of coal samples from various fields of the United States},
  author = {Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey},
  year = {1912},
  doi = {10.3133/b471j},
  url = {https://pubs.usgs.gov/publication/b471J},
  note = {Source identifier: b471J}
}