Plant Families: How To Know Them
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How to Know the Insects
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How to Know the Weeds: Pictured Keys for Identifying the More Common Weeds of Farm and Garden, with Interesting Facts Concerning Them
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How to Know the The Beetles
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How to Know the Water Birds
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How to Know the Beetles
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How to Know the Trees
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How to Know the Protozoa (pictured key nature series)
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Plant Families- How To Know Them
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Living Things and How to Know Them: Revised Edition
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How To Know the Insects/An Illustrated Key to the More Common Families of Insects, With Suggestions for Collecting, Mounting, and Studying Them.
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How To Know The Insects - An Illustrated Key To The More Common Families Of Insects, With Suggestions For Collecting, Mounting..
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Plants We Eat and Wear: An Illustrated Key to the Plants Upon Which Man is Directly Dependent for His Food and Clothing, with Some Essential Facts about Each Plant
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