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Scientific American 1930 to 1939

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1931-01: Why the Space Rocket? - MODERN STEEL MILL EFFICIENCY1931-02: AUTOMOBILE NUMBER1931-03: Future of the Rocket - RESEARCH ON THE MYSTERY OF THE AURORA1931-04: AMERICAN MADE LOCOMOTIVES FOR FOREIGN RAILROADS, Vacuum Tubes in Industry, A New Use for Radium. Radio in Crime Detection1931-05: How Big is a Quantum - HOW THE AVIATOR SEES A RAINBOW1931-06: Triangulation-Building the Backbone of Accurate Maps
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1931-02: AUTOMOBILE NUMBER

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