@misc{indiciaeecb0f7ec92bc,
  title = {Natural soil assemblages map of Montgomery County, Maryland},
  author = {A.J. Froelich},
  year = {1974},
  doi = {10.3133/ofr7470},
  url = {https://pubs.usgs.gov/publication/ofr7470},
  note = {Source identifier: ofr7470}
}