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International Symposium on Recent Advances with Pyrethrum the Natural Insecticide, University of Minnesota, 1972.
ScienceDirect http://www.sciencedirect.com/science/book/9780121629502
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Life-Span Conference (2nd : 1971 : West Virginia University)
ScienceDirect http://www.sciencedirect.com/science/book/9780125156509
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