@misc{indiciae5553e3e51857,
  title = {Extent and frequency of inundation of Schuylkill River flood plain from Conshohocken to Philadelphia, Pennsylvania},
  author = {A. T. Alter},
  year = {1966},
  doi = {10.3133/ofr662},
  url = {https://pubs.usgs.gov/publication/ofr662},
  note = {Source identifier: ofr662}
}