Treffer 1 - 4 von 4 für Suche 'National Research Council (U.S.) Committee on scientific aids to learning', Suchdauer: 0,45s Treffer weiter einschränken
  1. 1
    Broadcast receivers and phonographs for classroom use

    Broadcast receivers and phonographs for classroom use von National Research Council (U.S.). Committee on Scientific Aids to Learning

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  2. 2
    Sound recording equipment for schools

    Sound recording equipment for schools von National Research Council (U.S.) Committee on scientific aids to learning

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  3. 3
    Auditory aids in the class room

    Auditory aids in the class room von Hogan, John Vincent Lawless, 1890

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  4. 4
    Central sound systems for schools

    Central sound systems for schools von National Research Council (U.S.). Committee on Scientific Aids to Learning

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