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18:05, 15 August 2016 | 423 × 443 (194 KB) | Joe Kress | {{Information |Description ={{en|1=Cross section of rubble in shaft at 150 feet and typical of rubble below 150 feet}} |Source =http://www.publications.usace.army.mil/Portals/76/Publications/EngineerPamphlets/EP_870-1-21.pdf page 75 |Author... |