@misc{indiciaeb4886d102890,
  title = {Graphs showing percentage composition of sediments from water-bearing formations in southern Maryland, and maps showing the altitude of the base of sediments of Miocene age, and hardness of water sediments of Cretaceous age, in the same area},
  author = {E. G. Otton},
  year = {1954},
  doi = {10.3133/ofr54224},
  url = {https://pubs.usgs.gov/publication/ofr54224},
  note = {Source identifier: ofr54224}
}