@misc{indiciaef78f40fed600,
  title = {Estimate of depth to bed rock at some dam sites in the Gunnison, Little Colorado and Zuni River Basins, Colorado and Arizona, based on resistivity measurements 1938-1939},
  author = {H. Cecil Spicer},
  year = {1940},
  doi = {10.3133/ofr407},
  url = {https://pubs.usgs.gov/publication/ofr407},
  note = {Source identifier: ofr407}
}