@misc{indiciae9ed9c9cd7ac3,
  title = {Relation of the Wissahickon mica gneiss to the Shenandoah limestone and Octoraro schist of the Doe Run and Avondale region, Chester County, Pennsylvania},
  author = {Eleanora F. Bliss and Anna I. Jonas},
  year = {1917},
  doi = {10.3133/pp98b},
  url = {https://pubs.usgs.gov/publication/pp98B},
  note = {Source identifier: pp98B}
}