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      Scientific American September 21, 1901

      The Food of Nestling Birds—Bluebirds, Robins, and House Wrens

      • By Sylvester D. Judd on September 21, 1901

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      More in the September 21, 1901 issue of Scientific American
      • Australian Opal and Opal Mining
      • Men and Microbes
      • The Beet Sugar Industry
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