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| User Name | Thread Name | Subject | Posted |
| Donuel | BS: Hamas attacks Israel (284* d) | RE: BS: Hamas attacks Israel | 23 Oct 23 |
Ground penetrating radar instruments would use a 400-MHz radio wave impulse to define stratigraphy at a spacial resolution of tens of centimeters to 10-15 m depth from a high altitude of about a mile. It is best used at ground level. | |||