@misc{indiciaee82435f71a8d,
  title = {Tertiary igneous rocks and Laramide structure and stratigraphy of the Spanish Peaks Region, South-Central Colorado: Road log and descriptions from Walsenburg to La Veta},
  author = {Brian S. Penn and D. A. Lindsay},
  year = {1996},
  url = {https://pubs.usgs.gov/publication/70218184},
  note = {Source identifier: 70218184}
}