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Results of a biological survey of the San Francisco Mountain region and desert of the Little Colorado, Arizona : 1. General results with special reference to the geographical and vertical distribution of species. 2. Grand cañon of the Colorado. 3. Annotated list of mammals, with descriptions of new species. 4. Annotated list of birds
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An account of the mammals and birds of the lower Colorado valley : with especial reference to the distributional problems presented
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