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2. Flora of North America : north of Mexico

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3. A taxonomic revision of the acaulescent blue violets (Viola) of North America

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4. A student's atlas of flowering plants : some dicotyledons of eastern North America

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5. A biosystematic study of North American Thlaspi montanum and its allies

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6. Underwater and floating-leaved plants of the United States and Canada.

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7. The natural geography of plants

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