00334nam a2200133 a 450000500170000000800410001704100080005808200110006610000200007724500460009726400350014330000110017865000110018920260717091229.0260717s1985    ii            000 0 eng d  aeng04a581.151 aRichards, A. J.10aPlant breeding systems /cRichards, A. J. 1bGeorge Allen and Unwin,c1985.  a529 p. 4aBotany