IOBC-WPRS Bulletin Vol. 13 (2), 1990

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Proceedings onhe International Colloquium organized by the Subgroup on pear orchards of the Working Group: "Integrated Protection in Fruit Orchards".
Alcobaca (Portugal), 12-15 September 1989.
Edited by Thanh-Xuân Nguyen.
ISBN 92-9067-027-4 [191 pp.].

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