Classification
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662 - Explosives, fuels & related products
4
669 - Metallurgy
4
670 - Manufacturing
4
025 - Library operations
3
150 - Psychology
3
155 - Differential & developmental psychology
3
160 - Logic
3
338 - Production
3
512 - Algebra
3
531 - Classical mechanics; solid mechanics
3
536 - Heat
3
538 - Magnetism
3
540 - Chemistry & allied sciences
3
542 - Techniques, equipment & materials
3
546 - Inorganic chemistry
3
552 - Petrology
3
598 - Birds
3
610 - Medicine & health
3
617 - Surgery & related medical specialties
3
631 - Techniques, equipment & materials
3
003 - Systems
2
154 - Subconscious & altered states
2
330 - Economics
2
362 - Social welfare problems & services
2
501 - Philosophy & theory
2
502 - Miscellany
2
511 - General principles of mathematics
2
516 - Geometry
2
532 - Fluid mechanics; liquid mechanics
2
550 - Earth sciences
2
579 - Microorganisms, fungi & algae
2
581 - Specific topics in natural history
2
592 - Invertebrates
2
636 - Animal husbandry
2
663 - Beverage technology
2
910 - Geography & travel
2
001 - Knowledge
1
020 - Library & information sciences
1
115 - Time
1
146 - Naturalism & related systems
1
174 - Occupational ethics
1
300 - Social sciences
1
302 - Social interaction
1
306 - Culture & institutions
1
337 - International economics
1
346 - Private law
1
349 - Law of specific jurisdictions & areas
1
355 - Military science
1
368 - Insurance
1
382 - International commerce
1
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