@misc{indiciae53c4fe8e5d96,
  title = {A dual drawworks controller for borehole tomography},
  author = {T.P. Grover and R.P. Kipfinger and D.L. Wright},
  year = {1993},
  doi = {10.3133/ofr93324},
  url = {https://pubs.usgs.gov/publication/ofr93324},
  note = {Source identifier: ofr93324}
}