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Dordrecht, Etc. Martinus Nijhoff Publishers, 1988. Invited papers presented at a symposium held May 4-8, 1986, at the Beltsville Agricultural Research Centre (BARC), Beltsville, Maryland. ORganized by the bARC Symposium XI Committee. [xiv] 456p., b/w figures, original brown cloth. (Beltsville Symposia in Agricultural Research, 11).