@misc{indiciae2a47a0204570,
  title = {Water resources of the Edwards limestone in the San Antonio area, Texas},
  author = {Penn Livingston and A.N. Sayre and W. N. White},
  year = {1936},
  doi = {10.3133/wsp773b},
  url = {https://pubs.usgs.gov/publication/wsp773B},
  note = {Source identifier: wsp773B}
}