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The Sibley Guide to Birds
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A Field Guide to Western Reptiles and Amphibians (Peterson Field Guides (R))
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Field Guide to the Grasses, Sedges, and Rushes of the Northern United States
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The Nature and Properties of Soils (13th Edition)
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Ranching West of the 100th Meridian: Culture, Ecology, and Economics
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Biotic Communities: Southwestern United States and Northwestern Mexico
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