@misc{indiciae27ce21b165ec,
  title = {Contributions to economic geology, 1906, Part I, Metals and nonmetals except fuels--Portland, Natural, and Puzzolan Cements},
  author = {Ernest Francis Burchard and Sydney Hobart Ball},
  year = {1907},
  doi = {10.3133/b315f},
  url = {https://pubs.usgs.gov/publication/b315F},
  note = {Source identifier: b315F}
}