Appears to be map of sunspot activity. Perhaps related to geomagnetic work.
Photo Category: Coast and Geodetic Survey - Geophysics Seismology
Photo Date: 1966 September 22
| 551 x 640 | 25.04 KB | |
| 1102 x 1280 | 92.82 KB | |
| 1653 x 1920 | 198.92 KB | |
| 2472 x 2872 | 381.40 KB |
| Added On | 16th October 2015 |
| Viewed | 18 viewed |
| Downloads | 1 Downloaded |