1.
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Fort Atkinson, Wisc. : Nasco, c1965.
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2.
|
New York, Hafner Pub. Co., 1964 [c1950]
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3.
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New York : Crown Publishers, c1953.
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4.
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Lincoln, Neb., Johnsen Pub. Co. [1954]
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5.
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Englewood Cliffs, N.J., Prentice-Hall [1964]
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6.
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New York, The New York Botanical Garden, 1932.
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7.
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New York, Columbia University Press, c1964.
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8.
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Eureka, Calif. : Mad River Press, c1977.
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