Front Matter
p. 0
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Soil Instability in Tundra Vegetation
Sigafoos, R. S. pp. 281-298
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Mass-Wasting, Classification and Damage in Ohio
Savage, C. N. pp. 299-308
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Book Notices
p. 308
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A New Megalura Cercaria from Ohio
Banks, William M. pp. 309-312
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Fact and Myth in Social Class Theory
Adams, Stuart pp. 313-319
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Book Notices
p. 319
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Riddell's Notice of Vegetable Productions Growing Spontaneously in Washington County, Ohio
Walp, Russell Lee pp. 320-334
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Book Notices
p. 334
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Notes on the Reptiles and Amphibians of Greene County, Ohio
Duellman, William E. pp. 335-341
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Book Notices
p. 341
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The Problem of Puerto Rican Migrations to the United States
Hunker, Henry L. pp. 342-346
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Book Notices
p. 346
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A Systematic Study of the Main Arteries in the Region of the Heart--Aves XVII : Psittaciformes, Part I
Glenny, Fred H. pp. 347-352
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Book Notices
p. 352
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The Aesculus-Feeding Species of Exartema with Description of a New Species (Lepidoptera, Eucosmidae)
Braun, Annette F. pp. 353-357
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Index to Volume LI
pp. 358-359
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Back Matter
p. 999
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