@misc{indiciaedf0eed1047d4,
  title = {Geologic and anthropogenic factors influencing karst development in the Frederick region of Maryland},
  author = {D. K. Brezinski},
  year = {2007},
  doi = {10.1306/eg.01050605014},
  url = {https://pubs.usgs.gov/publication/70032857},
  note = {Source identifier: 70032857}
}