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Kaufman Field Guide to Advanced Birding: Understanding What You See and Hear
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A Field Guide to Poison Ivy, Poison Oak, and Poison Sumac: Prevention and Remedies ( Falcon Guide )
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National Geographic Pocket Guide to Trees and Shrubs of North America
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National Wildlife Federation Field Guide to Birds of North America
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National Wildlife Federation Field Guide to Insects and Spiders & Related Species of North America
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National Wildlife Federation Field Guide to Trees of North America
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Trees of North America: A Guide to Field Identification, Revised and Updated
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Birds of North America: A Guide to Field Identification
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Trees: Revised and Updated
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A Field Guide to Animal Tracks
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Peterson Field Guide to Freshwater Fishes of North America North of Mexico
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Track Finder: A Guide to Mammal Tracks of Eastern North America
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Fern Finder: A Guide to Native Ferns of Central and Northeastern United States and Eastern Canada
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Trees of Pennsylvania: Field Guide
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Pennsylvania Wildlife: An Introduction to Familiar Species
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A Field Guide to Stars and Planets
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Backyard Foraging: 65 Familiar Plants You Didn't Know You Could Eat
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Guide to the Mammals of Pennsylvania
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Trees of Pennsylvania: And the Northeast
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Sky & Telescope's Pocket Sky Atlas
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