@misc{indiciae0a7dc5bb980b,
  title = {Progress report on the hydrology of the Martinsburg Formation in Lehigh and Northampton Counties, Pennsylvania},
  author = {C.W. Poth},
  year = {1969},
  doi = {10.3133/ofr69212},
  url = {https://pubs.usgs.gov/publication/ofr69212},
  note = {Source identifier: ofr69212}
}