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Single, newstand issue of Scientific American for the week of June 11, 1921. Cover features a color illustration of Speeding up the laying and lifting of railroad rails. Features on a Giant Junk yard, Making Glass, Hydraulic Power, Lightning, Counting Bacteria, etc. pp17-36 [20pp], illustrated, advertising. Bright, clean, unmarked copy - not disbound. Staples a little rusted. Sound spine. Weight, 90g.

SCIENCE BRIDGES HELICOPTERS OIL