@misc{indiciae83daf5681ca0,
  title = {Interpreting geologic maps for engineering purposes: Hollidaysburg quadrangle, Pennsylvania},
  author = {Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey},
  year = {1953},
  doi = {10.3133/70045409},
  url = {https://pubs.usgs.gov/publication/70045409},
  note = {Source identifier: 70045409}
}