@misc{indiciae647c5774ed23,
  title = {Preliminary investigation of seismic tremors in the general area of the Leyden coal mine gas-storage reservoir, Colorado},
  author = {Frank W. Osterwald and John B. Bennetti and C. Richard Dunrud},
  year = {1973},
  doi = {10.3133/ofr73214},
  url = {https://pubs.usgs.gov/publication/ofr73214},
  note = {Source identifier: ofr73214}
}