Classification
650 - Management & auxiliary services
45
300 - Social sciences
19
658 - General management
12
616 - Diseases
11
620 - Engineering & allied operations
7
621 - Applied physics
6
001 - Knowledge
5
617 - Surgery & related medical specialties
5
657 - Accounting
3
003 - Systems
2
006 - Special computer methods
2
301 - Sociology & anthropology
2
330 - Economics
2
515 - Analysis
2
516 - Geometry
2
540 - Chemistry & allied sciences
2
572 - Biochemistry
2
612 - Human physiology
2
629 - Other branches of engineering
2
900 - History & geography
2
004 - Data processing & computer science
1
005 - Computer programming, programs & data
1
128 - Humankind
1
150 - Psychology
1
190 - Modern western philosophy
1
304 - Factors affecting social behavior
1
306 - Culture & institutions
1
339 - Macroeconomics & related topics
1
340 - Law
1
361 - Social problems & social welfare in general
1
362 - Social welfare problems & services
1
363 - Other social problems & services
1
370 - Education
1
501 - Philosophy & theory
1
531 - Classical mechanics; solid mechanics
1
539 - Modern physics
1
541 - Physical chemistry
1
551 - Geology, hydrology & meteorology
1
571 - Physiology & related subjects
1
577 - Ecology
1
610 - Medicine & health
1
615 - Pharmacology & therapeutics
1
624 - Civil engineering
1
720 - Architecture
1
910 - Geography & travel
1