@misc{indiciaec9acefbd61eb,
  title = {Altitude and configuration of the potentiometric surface in part of lower Providence Township, Montgomery County, Pennsylvania, May and June 1994},
  author = {B. C. McManus},
  year = {1995},
  doi = {10.3133/ofr95119},
  url = {https://pubs.usgs.gov/publication/ofr95119},
  note = {Source identifier: ofr95119}
}