@misc{indiciae5a7e6161eb11,
  title = {Chromite and other mineral deposits in serpentine rocks of the Piedmont Upland, Maryland, Pennsylvania, and Delaware},
  author = {Nancy C. Pearre and Allen V. Heyl},
  year = {1960},
  doi = {10.3133/b1082k},
  url = {https://pubs.usgs.gov/publication/b1082K},
  note = {Source identifier: b1082K}
}