Work at the Canyon by Dr. and Mrs. Washburn and Others
| Year | Time at the Canyon | Workdays | Helicopter Landings |
|---|---|---|---|
| 1971 | February 18-27 | 10 | 27 |
| 1971 | June 16-July 11 | 16 | 58 |
| 1972 | February 19-March 1 | 12 | 48 |
| 1972 | May 29-June 15 | 18 | 76 |
| 1972 | August 31-September 17 | 18 | 124 |
| 1973 | February 24 (R. Hinderlie) | 1 | 7 |
| 1973 | March 24-31 | 8 | 101 |
| 1973 | May 4 (Krahmer) | 2 | 4 |
| 1973 | May 21 (Krahmer) | 2 | 4 |
| 1973 | May 27 (Nicholson) | 1 | 4 |
| 1973 | June 13-July 4 | 21 | 101 |
| 1973 | October 21-23 | 3 | 11 |
| 1974 | February 21-March 4 | 12 | 114 |
| 1974 | July 26-29 | 4 | 7 |
| 1975 | February 22-March 1 | 8 | 13 |
| 1975 | June 28-July 6` | 8 | 13 |
| Totals | 144 | 712 |