por Petrunkevitch, Alexander.
por Merriman, Roger Bigelow.
por Morgan, Thomas Hunt.
por Hunt, Arthur Ellsworth | Peabody, James Edward.
por Engeln, O.D. von | Tarr, Ralph S | Williamson, B.F. Ilustrador.
por Black, Newton Henry Autor, assistant professor of physics Harvard University, formerly science master Roxbury Latin School Davis, Harvey Nathaniel Autor, president os Stevens Institute, formerly professor of mechanical engineering Harvard University.
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