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  1. The beaver : its work and its ways / by Edward Royal Warren.
    By: Warren, Edward Royal,
    Publication info: Baltimore :The Williams & Wilkins Company,1927.
    Contributed by: MBLWHOI Library
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  2. The life of the Yellowstone beaver /
    By: Warren, Edward Royal,
    Contributed by: Harold B. Lee Library (archive.org)
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  3. The mammals of Colorado; an account of the several species found within the boundaries of the state, together with a record of their habits and of their distribution,
    By: Warren, Edward Royal,
    Publication info: New YorkG. P. Putnam's sons,1910.
    Contributed by: Harvard University, Museum of Comparative Zoology, Ernst Mayr Library
    BHL Collections: Ernst Mayr Library of the MCZ, Harvard University
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  4. The small mammals of Colorado, by Edward Royal Warren.
    By: Warren, Edward Royal,
    Publication info: [Denver] :The Colorado mountain club,1921.
    Contributed by: University of California Libraries (archive.org)
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