@misc{indiciae80bf0c2bdea9,
  title = {Answers to 24 questions asked by the Honorary John R. Murdock, Member of Congress from Arizona, by letter of December 7, 1951, to the Director, U. S. Geological Survey},
  author = {L.C. Halpenny and R.L. Cushman and J. H. Feth},
  year = {1952},
  doi = {10.3133/ofr5268},
  url = {https://pubs.usgs.gov/publication/ofr5268},
  note = {Source identifier: ofr5268}
}