@misc{indiciae798e37366600,
  title = {Marble resources of Ketchikan and Wrangell districts},
  author = {E. F. Burchard},
  year = {1913},
  doi = {10.3133/b542b},
  url = {https://pubs.usgs.gov/publication/b542B},
  note = {Source identifier: b542B}
}