@misc{indiciae11d0be6da82d,
  title = {Preliminary geologic map of the Laredo, Crystal City–Eagle Pass, San Antonio, and Del Rio 1° x 2° quadrangles, Texas, and the Nuevo Laredo, Ciudad Acuña, Piedras Negras, and Nueva Rosita 1° x 2° quadrangles, Mexico},
  author = {William R. Page and Margaret E. Berry and D. Paco VanSistine and Scott R. Snyders},
  year = {2009},
  doi = {10.3133/ofr20091015},
  url = {https://pubs.usgs.gov/publication/ofr20091015},
  note = {Source identifier: ofr20091015}
}