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  1. By: Barus, Carl,
    Publication info: Washington, Carnegie institution of Washington, 1921-25
    Holding Institution: Cornell University Library
    Subjects: Gravitation  Interference (Light)  Sound  
  2. By: Allen, Zachariah,
    Publication info: New York [etc.], D. Appleton & Co, 1879
    Holding Institution: University of California Libraries
    Subjects: Gravitation  Solar heating  Sun  Temperature