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Data source: Dr. Milton W. Weller, Department of Zoology and Entomology, 

 Iowa State University, Ames, la. 50010. 



Other knowledgeable persons: Dr. Roger Landers, Botany Department, Iowa 

 State University, Ames, la. 50010; Dr. Leigh Fredrickson, Director, Gaylord 

 Memorial Laboratory, University of Missouri, Puxico, Mo. 63960. 



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