Archived: Interstate Technical Group on Abandoned Underground Mines
An Interactive Forum
Locating and Characterizing Abandoned Mines Using Microgravity: Figure 4
Figure 4. Seismic section of lines 4, 12, 20, and 28
U.S. Department of Transportation
Federal Highway Administration
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Figure 4. Seismic section of lines 4, 12, 20, and 28