http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Proceedings of the ... International Wheat Genetics Symposium
volumes : illustrations, maps ; 25-27 cm.
Publisher and place of publication vary with each edition.
Second symposium (1963) issued as Hereditas supplementary volume 2.
Fifth symposium (1978) published in 2 vols.