Guides and handbooks are reference manuals usually consulted for basic information or instruction, quick fact-finding, or for a concise and authoritative survey of a topic.
Flora of North America: North of Mexico
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Flowering Plant Families of the World
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Forest Trees: A Guide to the Eastern United States
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New Oxford Book of Food Plants, 2nd ed.
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Plants of Pennsylvania: An Illustrated Manual, 2nd ed.
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Poisonous Plants: A Handbook for Doctors, Pharmacists, Toxicologists, Biologists and Veterinarians, 2nd ed.
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Trees of Pennsylvania: A Complete Reference Guide
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Wild Flowers of the United States
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