@misc{indiciaeb24210658330,
  title = {Map showing outcrop distribution of building stone in the Bossardsville, Pennsylvania area, Saylorsburg 7 1/2-minute Quadrangle},
  author = {Jack Burton Epstein},
  year = {1976},
  doi = {10.3133/ofr76667},
  url = {https://pubs.usgs.gov/publication/ofr76667},
  note = {Source identifier: ofr76667}
}