The National Geographic Magazine, Volume 191National Geographic Society., 1997 - Geography |
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Page 79
... feet . " He made an extensive photo- graphic record of the peaks and believed that the highest soared to 28,000 feet . According to modern surveys , he overestimated by more than a mile ; the height is 20,610 feet . That was not his ...
... feet . " He made an extensive photo- graphic record of the peaks and believed that the highest soared to 28,000 feet . According to modern surveys , he overestimated by more than a mile ; the height is 20,610 feet . That was not his ...
Page 116
... feet from the bottom of the shaft , I will have to climb down a slippery metal ladder wearing knee- high , loosely ... feet of rock . The sandhogs will haul this muck up the shaft , moving the tunnel forward 12 feet a day . When the ...
... feet from the bottom of the shaft , I will have to climb down a slippery metal ladder wearing knee- high , loosely ... feet of rock . The sandhogs will haul this muck up the shaft , moving the tunnel forward 12 feet a day . When the ...
Page 125
... FEET East River : 83 feet deep below the Brooklyn Bridge . Sewer mains : Piers typically 3 to 15 feet 100 deep , deeper below subway platforms . 63rd Street Tunnel Piles Subways : typically 30 to 50 feet deep ; deepest lies 180 feet ...
... FEET East River : 83 feet deep below the Brooklyn Bridge . Sewer mains : Piers typically 3 to 15 feet 100 deep , deeper below subway platforms . 63rd Street Tunnel Piles Subways : typically 30 to 50 feet deep ; deepest lies 180 feet ...
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