TY - JA AU - Williams,W. TI - Methods of production of new varieties PY - 1981/// KW - Environmental factors KW - F1 hybrids KW - Gametes KW - Hybridization KW - Inbreeding KW - Inheritance (genetics) KW - Pure lines KW - Selection KW - Plant breeding KW - AGROVOC N1 - Peer-review: Yes - Open Access: Yes|http://science.thomsonreuters.com/cgi-bin/jrnlst/jlresults.cgi?PC=MASTER&ISSN=0962-8436 T2 - Philosophical Transactions of the Royal Society of London. Series B. Biological Science ER -