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575 - General genetics. General cytogenetics (85)
504 - Threats to the environment (46)
634 - Fruit growing (40)
502 - The environment and its protection (26)
579 - Microbiology (21)
630 - Forestry (19)
631/635 - Farm management. Agronomy. Horticulture (19)
59 - Zoology (18)
33 - Economics. Economic science (16)
57 - Biological sciences in general (13)