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19TH INTERNATIONAL SEED TESTING CONGRESS HELD IN VIENNA, AUSTRIA, IN JUNE 1980MACKAY DB ED; ADER F ED; GORDON AG ED et al.1981; SEED SCI. TECHNOL.; NOR; DA. 1981; VOL. 9; NO 1; 356 P.; ABS. FRE/GER; BIBL. DISSEM.Conference Paper