@misc{indiciae5c4c717cdc8c,
  title = {Bog iron formation in the Nassawango Watershed, Maryland},
  author = {Owen P. Bricker and Wayne L. Newell and Nancy S. Simon},
  year = {2003},
  doi = {10.3133/ofr03346},
  url = {https://pubs.usgs.gov/publication/ofr03346},
  note = {Source identifier: ofr03346}
}