@misc{indiciae171a9e43fbd5,
  title = {Geophysical abstracts 140, January-March 1950},
  author = {M.C. Rabbitt and V.L. Skitsky and S.T. Vesselowsky},
  year = {1950},
  doi = {10.3133/b976a},
  url = {https://pubs.usgs.gov/publication/b976A},
  note = {Source identifier: b976A}
}