@misc{indiciae7d9277b6c24a,
  title = {Altitude and configuration of the potentiometric surface in New Hope Borough and Solebury Township, Bucks County, Pennsylvania, October 1991 through April 1992},
  author = {Curtis L. Schreffler},
  year = {1993},
  doi = {10.3133/ofr9328},
  url = {https://pubs.usgs.gov/publication/ofr9328},
  note = {Source identifier: ofr9328}
}