@misc{indiciaef1ce9ee72cc6,
  title = {Environmental geologic map of the Harbor Island area, Texas},
  author = {S.B. Casby},
  year = {1975},
  doi = {10.3133/mf687},
  url = {https://pubs.usgs.gov/publication/mf687},
  note = {Source identifier: mf687}
}