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  1. 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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  2. Report on the birds of Pennsylvania. With special reference to the food-habits, based on over four thousand stomach examinations.
    By: Pennsylvania. - Warren, B. H.
    Edition: 2d ed.
    Publication info: Harrisburg,E. K. Meyers, state printer,1890.
    Contributed by: University of California Libraries (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 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
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