@misc{indiciae1c88e004bdb5,
  title = {Mineral resource potential map of the Four Notch Roadless Area, Sam Houston National Forest, Walker County, Texas},
  author = {B. B. Houser and G. S. Ryan},
  year = {1983},
  doi = {10.3133/mf1549},
  url = {https://pubs.usgs.gov/publication/mf1549},
  note = {Source identifier: mf1549}
}