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  1. The birds of Cerro de la Neblina, Territorio Federal Amazonas, Venezuela / David E. Willard ... [et al.].
    By: Willard, David E.
    Publication info: [Chicago, Ill.] :Field Museum of Natural History,c1991.
    Contributed by: University of Illinois Urbana Champaign
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  2. The birds of Sibuyan Island, Romblon Province, Philippines : with particular reference to elevational distribution and biogeographic affinities / Steven M. Goodman, David E. Willard, Pedro C. Gonzales.
    By: Goodman, Steven M. - Gonzales, Pedro C. - Willard, David E. - Field Museum of Natural History.
    Publication info: [Chicago, Ill.] :Field Museum of Natural History,c1995.
    Contributed by: University of Illinois Urbana Champaign
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