Classification
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398 - Folklore
2
400 - Language
44
401 - Philosophy & theory
1
405 - Serial publications
1
407 - Education, research & related topics
1
410 - Linguistics
22
414 - Phonology & phonetics
6
415 - Grammar
4
418 - Standard usage & applied linguistics
2
420 - English & Old English
15
491 - East Indo-European & Celtic languages
1
500 - Natural sciences & mathematics
75
509 - Historical, geographic & persons treatment
1
510 - Mathematics
1
520 - Astronomy & allied sciences
4
530 - Physics
12
540 - Chemistry & allied sciences
19
551 - Geology, hydrology & meteorology
12
570 - Life sciences; biology
33
571 - Physiology & related subjects
3
572 - Biochemistry
2
576 - Genetics & evolution
37
577 - Ecology
2
580 - Plants (Botany)
26
581 - Specific topics in natural history
10
600 - Technology
100
610 - Medicine & health
386
612 - Human physiology
26
613 - Personal health & safety
9
614 - Incidence & prevention of disease
4
615 - Pharmacology & therapeutics
16
616 - Diseases
133
617 - Surgery & related medical specialties
1
618 - Gynecology, obstetrics, pediatrics & geriatrics
1
620 - Engineering & allied operations
61
621 - Applied physics
19
628 - Sanitary & municipal engineering
2
629 - Other branches of engineering
16
630 - Agriculture & related technologies
7
632 - Plant injuries, diseases & pests
1
634 - Orchards, fruits & forestry
1
640 - Home & family management
23
646 - Sewing, clothing & personal living
6
650 - Management & auxiliary services
218
651 - Office services
3
657 - Accounting
3
658 - General management
418
659 - Advertising & public relations
3
660 - Chemical engineering
1
668 - Technology of other organic products
1
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