Classification
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520 - Astronomy & allied sciences
1
534 - Sound & related vibrations
1
535 - Light & infrared & ultraviolet phenomena
1
537 - Electricity & electronics
1
547 - Organic chemistry
1
549 - Mineralogy
1
550 - Earth sciences
1
571 - Physiology & related subjects
1
577 - Ecology
1
579 - Microorganisms, fungi & algae
1
624 - Civil engineering
1
796 - Athletic & outdoor sports & games
1