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  1. The birds of North and Middle America : a descriptive catalogue of the higher groups, genera, species, and subspecies of birds known to occur in North America, from the Arctic lands to the Isthmus of Panama, the West Indies and other island
    By: Ridgway, Robert, - Friedmann, Herbert,
    Publication info: Washington :Govt. Print. Off.,1901-
    Contributed by: Cornell University Library
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  2. The birds of North and middle America: a descriptive catalogue of the higher groups, genera, species, and subspecies of birds known to occur in North America, from the Arctic lands to the Isthmus of Panama, the West Indies and other island
    By: Ridgway, Robert, - Friedmann, Herbert,
    Publication info: Washington,Govt. Print. Off.,1901-
    Contributed by: Boston College Libraries (archive.org)
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  3. The natural-history background of camouflage,
    By: Friedmann, Herbert,
    Publication info: Washington, D.C. :The Smithsonian Institution,1942.
    Contributed by: Smithsonian Libraries
    BHL Collections: Smithsonian Institution Libraries
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