631.521
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International rules for seed testing rules 1993 : adopted at the twenty-third International Seed Testing Congress, Argentina 1992, to become effective on 1 july 1993.
— Zürich, Switzerlnad : International Seed Testing Association, 1993. 288 p. ; 24 cm. — (Seed Science & Technology ; v. 21(suppl.))
ISBN 3906549275
ISSN 0251-0952
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