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Scientific American, Vol. 82, No. 14 (1900) (1900)
leaf 8
APRIL 7, 217 1900. … Vertacal Scale Feet # 3 mw i 50 Feet). Fig. 6.—LONGITUDINAL OF TUNNEL. — *: = Fig. 6._INTERIOR VIEW OF BLACKWALL TUNNEL, BENEATH THE THAMES, SHOWING CAST IRON LINING COMPLETED.Internet Archive · Public domain (published before 1931). Free to use for anything.
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