Click on link to download letter in .pdf format
| Letters from 1967: |
| 12.28.67: From The Institute for Advanced Study to J. W. Keuffel, University of Utah | Congratulations on the splendid success of your experiment! All the.. |
| 11.07.67: From University of California to J. W. Keuffel, University of Utah | Thanks for the preprint of your exciting results.. |
|
