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| Caterpillars in the Field and Garden: A Field Guide to the Butterfly Caterpillars of North America | Allen, T.J. Brock J. P. Glassberg, J. | Wildlife |
| Caterpillars of Eastern North America: A Guide to Identification and Natural History | Wagner, D.L. | Wildlife |
| Central Appalachian Wildflowers | Medina, B. F.; V. Medina | Wildflowers |
| Central Rocky Mountain Wildflowers: Including Yellowstone and Grand Teton National Parks (Wildflower Series) (1st Edition) | Phillips, W. | Plant Identification
Wildflowers |
| Changing Mile Revisited: An Ecological Study of Vegetation Change With Time in the Lower Mile of an Arid and Semiarid Region | Turner, R. M. | Natural History |
| Checklist of New York State Plants | Mitchell, R.S. | Plant Identification |
| Chesapeake Bay: Nature of the Estuary: A Field Guide | White, C. P.;Teramura, K. | Wildlife |
| Chestnuts, Galls, and Dandelion Wine: Useful Wild Plants of the Boston Harbor Islands | Perkins, W. D. | Edible Plants
Useful Plants |
| Chilies to Chocolate: Food the Americas Gave the World | Foster, N. & L. S. Cordell (eds.) | Edible Plants |
| City Herbal: Lore, Legend, and Uses of Common Weeds | Silverman, M. | Edible Plants
Medicinal Plants
Useful Plants |
| Climbing Gardens: Adding Height and Structure to Your Garden | Clifton, J. | Gardening |
| Coastal Dune Plants: The Common Plants of Southeast Florida's Ocean-Side Communities | Austin, Daniel; Penelope Honychurch; Steve Bass | Natural History
Plant Identification
Useful Plants |
| Coastal Hammock and Mangrove Guide: A pocket guide to the common trees, shrubs, and vines of S.E. Florida's hammock and mangrove communities | Austin, Daniel; Penelope Honychurch; Steve Bass | Natural History
Plant Identification |
| Coastal Lowland Wildflowers | Underhill, J. E.; D. Ottosen | Wildflowers |
| Coastal Plants from Cape Cod to Cape Canaveral | Stuckey, I.H., Gould, L.L. | Wildflowers |
| Coastal Wildflowers of the Pacific Northwest: Wildflowers and Flowering Shrubs from British Columbia to Northern California | Horn, E.L. | Wildflowers |
| Collecting, Processing, and Germinating Seeds of Wildland Plants | Young, J. & C. Young | Wildflowers
Plant Propagation |
| Color Atlas of Plant Propagation and Conservation | Bowes, B. G. | Natural History
Plant Propagation |
| Colorado Flora: Eastern Slope | Weber, W.A.; R. C. Wittmann | Plant Identification |
| Colorado Flora: Western Slope | Weber, W. A.; R. C. Wittmann | Plant Identification |
| Colorado Gardener's Guide | Crett, J. | Gardening |
| Colorado Trees & Wildflowers: An Introduction to Familiar Species (State Nature Guides) (First Edition) | Kavanagh, J. | Plant Identification |
| Common Coastal Plants in Florida: A Guide to Planting and Maintenance | Barnett, M.R. | Plant Identification |
| Common Edible & Useful Plants of the East & Midwest | Sweet, M. | Useful Plants
Edible Plants |
| Common Edible and Useful Plants of the West | Sweet, M. | Edible Plants
Useful Plants |
| Common flora of the playa lakes | Haukos, D.A. & L.M. Smith | Plant Identification
Natural History |
| Common Flowering Plants of the Northeast: their natural history and uses | Cox, D. D. | Useful Plants
Medicinal Plants
Edible Plants |
| Common grasses & sedges in North Dakota | Dodds, D. L. | Plant Identification |
| Common Grasses of Florida and the Southeast | Yarlett, Lewis | Plant Identification |
| Common Legumes of the Great Plains (First Edition) | Conard, E. C. and Stubbendieck, J. | Plant Identification |
| Common Plants of the Mid-Atlantic Coast: A Field Guide | Silberhorn, G.M. | Plant Identification |
| Common Poisonous Plants and Mushrooms of North America. | Turner, N. J. & A. F. Szczawinski | Poisonous Plants |
| Common riparian plants of California :
a field guide for the layman | Faber, P. M.; R. F. Holland | Plant Identification |
| Common Southwestern Native Plants: An Identification Guide | Carter, J. L.; M. A. Carter; D. J. Stevens | Gardening
Plant Identification |
| Common Texas Grasses: An Illustrated Guide | Gould, F. W. | Plant Identification |
| Common Wetland Plants of Coastal California: a field guide for the layman | Faber, P.M. | Plant Identification |
| Common Wild Flowers of Minnesota | Monserud, W.; G. B. Ownbey | Wildflowers |
| Community Forests of Mexico: Managing for Sustainable Landscapes | Bray, D. B.; L. Merino-Pérez; D. Barry | Landscaping
Natural History
Useful Plants |
| Complete Book of Herbs: A Practical Guide to Cultivating, Drying, and Cooking With More Than 50 Herbs | Callery, E. | Edible Plants
Medicinal Plants |
| Complete Book of Plant Propagation | Clarke, G.; A. R. Toogood | Plant Propagation |
| Complete Garden Guide to Native Shrubs of California | Keator, G. | Gardening
Plant Identification |
| Complete Garden Guide to the Native Perennials of California | Keator, G. | Gardening
Plant Identification |
| Complete Guide to Florida Wildflowers: Over 600 Wildflowers of the Sunshine State including National Parks, Forests, Preserves and More than 160 State Parks (Wildflowers in the National Parks Series) | Hammer, R. L. | Natural History
Plant Identification |
| Complete Outdoorsman's Guide to Edible Wild Plants | Berglund, B. & C. E. Bolsby | Edible Plants |
| Conducting Prescribed Fires: A Comprehensive Manual | John R. Weir | Landscaping
Sustainable Landscaping
Wildflowers
Wildlife |
| Conifers for Gardens: An Illustrated Encyclopedia | Bitner, R. L. | Gardening |
| Conifers of California | Lanner, R.M. | Plant Identification
Natural History |
| Connecticut Trees & Wildflowers: An Introduction to Familiar Species (State Nature Guides) | Kavanagh, J. | Wildflowers |
| Conservation Plants for the Northeast | Lorenz, D. G. ; W. C. Sharp; J. D. Ruffner | Plant Identification
Natural History |
| Consider the Leaf: Foliage in Garden Design | Glattstein, J. | Gardening
Landscaping |
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