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A Revision of the North American Aphids of the Genus Myzus
A systematic study of the North American species of the aphid genus Myzus Passerini is presented in this publication. It brings together the known species, listing their hosts and giving their distributions, the locations of their types, and descriptions, drawings, and keys for their separation.
Family Income and Expenditures
The study of consumer purchases, planned in the latter part of 1935 and inaugurated early in 1936, was undertaken to provide data more comprehensive than any before available on the way in which American families earn and spend their incomes.
Famous Trees
Trees by their very nature are landmarks and memorials. They are therefore identified with human happenings. Trees also have more than the allotted life span of man and carry their association through generations of men and women. Thus they often figure not only in biography but also in history.
General Catalog
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