@misc{indiciae81f6765bfc81,
  title = {Sand and gravel resources of the San Bernardino National Forest, California},
  author = {R. C. Greene and J.P. Calzia},
  year = {1995},
  doi = {10.3133/ofr95535},
  url = {https://pubs.usgs.gov/publication/ofr95535},
  note = {Source identifier: ofr95535}
}