BRIDGE BUILDING ON THE PENNSYLVANIA RAILWAY WITHOUT INTERRUPTING TRAFFIC. The Nordenfelt Submarine Torpedo Boat. Japanese Laborers. The Flood in China. Fig. 3. MOVING BRIDGE SPANS ON PENN. , scientific american, 1888-01-21
BRIDGE BUILDING ON THE PENNSYLVANIA RAILWAY WITHOUT INTERRUPTING TRAFFIC. The Nordenfelt Submarine Torpedo Boat. Japanese Laborers. The Flood in China. Fig. 3. MOVING BRIDGE SPANS ON PENN. , scientific american, 1888-01-21
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