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Heinrich Schellen

    Die Schule Der Elementar-Mechanik Und Maschinenlehre Für Den Selbstunterricht ...
    Die Spektralanalyse
    Magneto-Electric and Dynamo-Electric Machines: Their Construction and Practical Application to Electric Lighting and the Transmission of Power; Volume
    Spectrum Analysis Explained ...: Including an Explanation of the Received Theory of Sound, Heat, Light, and Color
    Spectrum Analysis in Its Application to Terrestrial Substances, and the Physical Constitution of the Heavenly Bodies. Familiarly Explained by Dr. H. S
    Spectrum Analysis in Its Application to Terrestrial Substances, and the Physical Constitution of the Heavenly Bodies