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By "Parker, William Bell. "
Flour paste as a control for red spiders and as a spreader for contact insecticides /
By: Parker, William Bell. - United States.
Publication info: Washington, D.C. :U.S. Dept. of Agriculture, Bureau of Entomology,1913.
Contributed by: U.S. Department of Agriculture, National Agricultural Library
The hop aphis in the Pacific region.
By: Parker, William Bell.
Publication info: Washington,Govt. print. off.,1913.
Contributed by: Library of Congress
BHL Collections: Library of Congress