@misc{indiciae1de568aaec84,
  title = {Geologic map of Big Bend National Park, Texas},
  author = {Kenzie J. Turner and Margaret E. Berry and William R. Page and Thomas M. Lehman and Robert G. Bohannon and Robert B. Scott and Daniel P. Miggins and James R. Budahn and Roger W. Cooper and Benjamin J. Drenth and Eric D. Anderson and Van S. Williams},
  year = {2011},
  doi = {10.3133/sim3142},
  url = {https://pubs.usgs.gov/publication/sim3142},
  note = {Source identifier: sim3142}
}