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By: Mackensen, Otto, - Roberts, W. C. - United States. Office of Experiment Stations.Edition:Publication info: [Washington, D.C.], [U.S. Dept. of Agriculture, Agricultural Research Administration, Bureau of Entomology and Plant Quarantine], [1948]Volume:Series:Holding Institution: University of Florida, George A. Smathers LibrariesSubjects:BHL Collections: Expanding Access to Biodiversity Literature