Classification
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400 - Language
47
401 - Philosophy & theory
5
404 - Special topics
2
407 - Education, research & related topics
6
410 - Linguistics
42
411 - Writing systems
1
414 - Phonology & phonetics
2
418 - Standard usage & applied linguistics
14
428 - Standard English usage
1
440 - Romance languages; French
1
490 - Other languages
6
491 - East Indo-European & Celtic languages
2
500 - Natural sciences & mathematics
23
501 - Philosophy & theory
4
507 - Education, research & related topics
1
509 - Historical, geographic & persons treatment
7
510 - Mathematics
1
520 - Astronomy & allied sciences
8
530 - Physics
5
531 - Classical mechanics; solid mechanics
1
540 - Chemistry & allied sciences
2
550 - Earth sciences
4
551 - Geology, hydrology & meteorology
14
570 - Life sciences; biology
3
571 - Physiology & related subjects
4
576 - Genetics & evolution
11
577 - Ecology
6
580 - Plants (Botany)
8
581 - Specific topics in natural history
12
591 - Specific topics in natural history
1
600 - Technology
59
610 - Medicine & health
63
612 - Human physiology
2
613 - Personal health & safety
6
614 - Incidence & prevention of disease
4
616 - Diseases
7
617 - Surgery & related medical specialties
1
618 - Gynecology, obstetrics, pediatrics & geriatrics
2
620 - Engineering & allied operations
22
621 - Applied physics
1
624 - Civil engineering
1
630 - Agriculture & related technologies
17
634 - Orchards, fruits & forestry
4
649 - Child rearing & home care of persons
1
650 - Management & auxiliary services
9
657 - Accounting
1
658 - General management
68
659 - Advertising & public relations
2
660 - Chemical engineering
2
670 - Manufacturing
5
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