Parker, Neville Friend2006-12-282006-12-2819781978http://hdl.handle.net/2440/21123xix, 157 leaves : photos., graphs, tables ; 30 cm.Title page, contents and abstract only. The complete thesis in print form is available from the University Library.554334 bytesapplication/pdfenPyrimidines.Helianthus tuberosum.Thesis