@misc{indiciaefd20b04ccab6,
  title = {Operating manual for the R100 digital vibration-time totalizer},
  author = {Edwin H. Cordes and Minghua Shi},
  year = {1988},
  doi = {10.3133/ofr88454},
  url = {https://pubs.usgs.gov/publication/ofr88454},
  note = {Source identifier: ofr88454}
}