@misc{indiciaec3c3ac3ebd6d,
  title = {Petrographic study of sandstone of the Inyan Kara group (Cretaceous) and associated rocks in the Black Hills, Wyoming and South Dakota},
  author = {Richard E. Bergenback and Wayne A. Chisholm and William Jameson Mapel},
  year = {1957},
  doi = {10.3133/tei685},
  url = {https://pubs.usgs.gov/publication/tei685},
  note = {Source identifier: tei685}
}