NOVEL WINDOW-GUARD AND PLY-SCREEN. COMBINED WINDOW-GUARD AND FLY-SCREEN. The Work of the United States Forester. Photographing Upon Marble. LORD KELVIN'S ELECTRIC TROLLEY RAIL TESTER. A NEW FORM OF WEEDING-MACHINE. Early Methods of Food Preservation. The Krupp Iron Works., scientific american, 1900-05-12
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