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  1. Schaumburg, Bruno P. [Author]

    Männer aus eigener Kraft

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    Leipzig: Koehler & Amelang, 1938

  2. Warmuth, Ludwig [Editor]

    Deutsche Technik : ein Lesebuch

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    Berlin [u.a.]: Elsner, 1944

  3. Hylander, Clarence J. [Author] ; Pockrandt, Willy [Other]

    Amerikanische Erfinder

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    München: Hanser, 1947

  4. Burt, McKinley [Author]

    African-American inventors

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    Portland, Or.: National Book Co., 2000