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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 islands of the Caribbean sea, and the Galapagos Archipelago.
    By: Ridgway, Robert, - Friedmann, Herbert,
    Publication info: Washington,Govt. Print. Off.,1901-
    Holding Institution: Boston College Libraries (archive.org)
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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 islands of the Caribbean sea, and the Galapagos Archipelago /
    By: Ridgway, Robert, - Friedmann, Herbert,
    Publication info: Washington :Govt. Print. Off.,1901-
    Holding Institution: Cornell University Library
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  3. The natural-history background of camouflage,
    By: Friedmann, Herbert,
    Publication info: Washington, D.C. :The Smithsonian Institution,1942.
    Holding Institution: Smithsonian Libraries
    View Book