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633 - Field crops and their production (4)
63 - Agriculture and related sciences and techniques (3)
Aqüicultura (3)
Fruita -- Postcollita (3)
Fungicides -- Aplicacions (3)
Fusta d'indústria (3)
Noguera (Arbre) -- Conreu (3)
Viticultura (3)
Agricultura -- Aspectes ambientals -- Congressos (2)
Ametller -- Conreu i millora (2)