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  1. Our physical world; a source book of physical nature-study, by Elliot Rowland Downing ... with a chapter on radio communication by Fred G. Anibal ...
    By: Downing, Elliot Rowland, - Anibal, Fred G.
    Publication info: Chicago, Ill.,The University of Chicago press[c1924]
    Contributed by: Prelinger Library (archive.org)
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