Classification
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351 - Public administration
6
355 - Military science
2
358 - Air & other specialized forces
1
360 - Social problems & services; associations
16
361 - Social problems & social welfare in general
42
362 - Social welfare problems & services
17
363 - Other social problems & services
52
364 - Criminology
650
365 - Penal & related institutions
15
370 - Education
19
378 - Higher education
2
380 - Commerce, communications & transportation
7
384 - Communications; telecommunication
1
398 - Folklore
1
407 - Education, research & related topics
4
410 - Linguistics
1
500 - Natural sciences & mathematics
30
511 - General principles of mathematics
1
519 - Probabilities & applied mathematics
6
520 - Astronomy & allied sciences
1
530 - Physics
1
531 - Classical mechanics; solid mechanics
1
543 - Analytical chemistry
2
551 - Geology, hydrology & meteorology
1
570 - Life sciences; biology
1
571 - Physiology & related subjects
1
576 - Genetics & evolution
1
577 - Ecology
1
581 - Specific topics in natural history
1
600 - Technology
10
610 - Medicine & health
16
612 - Human physiology
2
613 - Personal health & safety
14
614 - Incidence & prevention of disease
36
615 - Pharmacology & therapeutics
2
616 - Diseases
23
620 - Engineering & allied operations
9
621 - Applied physics
7
629 - Other branches of engineering
1
630 - Agriculture & related technologies
3
641 - Food & drink
1
650 - Management & auxiliary services
4
657 - Accounting
1
658 - General management
13
660 - Chemical engineering
3
664 - Food technology
1
670 - Manufacturing
1
700 - The arts; fine & decorative arts
7
720 - Architecture
1
770 - Photography, photographs & computer art
1
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