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A Manual of Mammalogy with Keys to Families of the World

Keys to Identification of the Orders and Families of Living Mammals of the World


Key to North American Waterfowl

How to Know the Water Birds: Pictured-Keys for Determining the Water Birds of the United States and Canada, With Maps Showing Their Geographic Distribution


How to Know the Beetles (Pictured Key Nature Series)

How to Know the Butterflies: Illustrated Keys for Determining to Species

Mosquitoes of New York : Part I. The Genus Aedes Meigen With Identification Keys to Genera of Culicidae (New York State Museum Bulletin # 430A)

Illustrated key to the mosquitoes of Ohio : adapted from C.J. Stojanovich's keys to the common mosquitoes of eastern United States


Marine Invertebrates of the Pacific Northwest

Keys to the Vertebrates of the Eastern United States, Excluding Birds

A Key to Amphibians & Reptiles of the Continental United States and Canada

No Bones: A Key to Bugs and Slugs, Worms and Ticks, Spiders and Centipedes, and Other Creepy Crawlies


How to Know the Protozoa


How to Know the Western Trees (Pictured Key Nature Series)

Winter Twigs: A Wintertime Key to Deciduous Trees and Shrubs of Northwestern Oregon and Western Washington


Keys to the Flora of Arkansas

The Jepson Manual : Higher Plants of California

How to Know the Fall Flowers: Pictured-Keys for Determining the More Common Fall-Flowering Herbaceous Plants With Suggestions and Aids for Their Study

Descriptive Key to the Grasses of Ohio, Based on Vegetative Characters (Bulletin of the Ohio Biological Survey, New Series, Vol 7, No 1)

Aquatic and Wetland Plants of Northeastern North America : Angiosperms : Monocotyledons

New Mexico Grasses: A Vegetative Key

Key to Coastal and Chaparral Flowering Plants of Southern California

The lichens of British Columbia : illustrated keys

How to Know the Freshwater Algae

Plants We Eat and Wear: An Illustrated Key to the Plants upon Which Man Is Directly Dependent for His Food and Clothing


Plant Families, How to Know Them: Pictured-Keys for Determining the Families of Nearly All of the Members of the Entire Plant Kingdom

The Identification of Flowering Plant Families : Including a Key to Those Cultivated in North Temperate Regions