@misc{indiciae68444a34ec13,
  title = {Galactic cosmic ray modulation from 1965-1970.},
  author = {Urch, I. H. and Gleeson, L. J.},
  year = {1972},
  url = {https://ntrs.nasa.gov/citations/19730028560},
  note = {Source identifier: 19730028560}
}