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Displaying items 11-20
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502 - The environment and its protection (4)
62 - Engineering. Technology in general (4)
504 - Threats to the environment (3)
33 - Economics. Economic science (1)
579 - Microbiology (1)
58 - Botany (1)
628 - Public health engineering. Water. Sanitation. Illuminating engineering (1)
635 - Garden plants. Gardening (1)
638 - Keeping, breeding and management of insects and other arthropods (1)
64 - Home economics. Domestic science. Housekeeping (1)
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