Tree Finder: A Manual for Identification of Trees by their Leaves (Eastern US) (Nature Study Guides)

Turtles of the World: A Guide to Every Family

Nature's Palette: A Color Reference System from the Natural World

National Audubon Society Field Guide to Insects and Spiders: North America (National Audubon Society Field Guides)

The Wildlife of Costa Rica: A Field Guide (Zona Tropical Publications)

The Journals Of Lewis And Clark (Lewis & Clark Expedition)

National Geographic Pocket Guide to Trees and Shrubs of North America

National Geographic Field Guide to the Birds of Eastern North America (National Geographic Field Guide to Birds)

Birds of North America: A Guide To Field Identification (Golden Field Guide from St. Martin's Press)

Alaska's Wild Plants, Revised Edition: A Guide to Alaska's Edible and Healthful Harvest