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  1. Diseases and enemies of poultry. Pearson & Warren.
    By: Pearson, Leonard, - Warren, Benjamin Harry,
    Publication info: Harrisburg,C.M. Busch, state printer,1897
    Contributed by: Smithsonian Libraries
    BHL Collections: Smithsonian Libraries
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  2. Diseases of poultry part 1 / by Leonard Pearson. Enemies of poultry : part 2 / by B.H. Warren.
    By: Pearson, Leonard, - Warren, Benjamin Harry,
    Publication info: Harrisburg, Pa. :C.M. Busch, state printer,1897.
    Contributed by: Penn State University (archive.org)
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  3. Report on the birds of Pennsylvania : with special reference to the food habits, based on over three thousand stomach examinations /
    By: Pennsylvania. - Warren, Benjamin Harry,
    Publication info: Harrisburg :E.K. Meyers, State Printer,1888.
    Contributed by: University of California Libraries (archive.org)
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  4. Report on the birds of Pennsylvania : with special reference to the food habits, based on over four thousand stomach examinations / by B.H. Warren.
    By: Warren, Benjamin Harry,
    Edition: 2d ed., rev. and augm.
    Publication info: Harrisburg :E.K. Meyers, State Printer,1890.
    Contributed by: Penn State University (archive.org)
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  5. Report on the birds of Pennsylvania. With special reference to the food-habits, based on over three thousand stomach examinations. By B.H. Warren, M.D., ornithologist of the State Board of Agriculture. Illustrated with fifty plates ...
    By: Pennsylvania. - Warren, Benjamin Harry,
    Publication info: Harrisburg,E.K. Meyers, State Printer,1888.
    Contributed by: Smithsonian Libraries
    BHL Collections: Smithsonian Libraries
    View Book