ness is determined by the passes. In its revolution the shutter nature of the excavation is carefully presents its closed and open part alter- rammed in place. The subway as thus nately. The size of the pinions is finished is inclosed in a waterproof such that the open part of the shutter envelope,… … Approach to Subway, Showing Portal in Distance. Portal of Subway at 136th Street. fB0O££SS 07 TEE HEW YOBS SAFIO TBANSIT TUNNEL. 11901 SCIENTIFIC AMERICAN, INC.
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