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Weed Management In Agroecosystems: Ecological Approaches. Boca Raton, FL: CRC Press, Inc. http://www.worldcat.org/oclc/16682275.
. 1988. T
“Traditional Agriculture And Plant Pathology (Tapp) Database [Ascii Format For The Macintosh]”. Ithaca, NY: Cornell University Department of Plant Pathology.
. 1990.