An Esker Group South of Dayton, Ohio
Scheffel, Earl R. pp. 231-242
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Notes on the Aphididae : Observations on a Semi-aquatic Aphid, Aphis aquaticus n. sp.
Jackson, C. F. pp. 243-249
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New Books
J. S. H. p. 250
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Natural History Survey
p. 250
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