Classification
300 - Social sciences
594
001 - Knowledge
578
620 - Engineering & allied operations
411
650 - Management & auxiliary services
133
670 - Manufacturing
86
610 - Medicine & health
76
621 - Applied physics
53
510 - Mathematics
37
629 - Other branches of engineering
16
338 - Production
15
616 - Diseases
15
658 - General management
13
003 - Systems
12
330 - Economics
11
370 - Education
10
547 - Organic chemistry
10
340 - Law
7
540 - Chemistry & allied sciences
7
530 - Physics
6
150 - Psychology
5
551 - Geology, hydrology & meteorology
5
624 - Civil engineering
5
304 - Factors affecting social behavior
4
336 - Public finance
4
511 - General principles of mathematics
4
515 - Analysis
4
519 - Probabilities & applied mathematics
4
531 - Classical mechanics; solid mechanics
4
541 - Physical chemistry
4
570 - Life sciences; biology
4
617 - Surgery & related medical specialties
4
660 - Chemical engineering
4
691 - Building materials
4
339 - Macroeconomics & related topics
3
410 - Linguistics
3
516 - Geometry
3
553 - Economic geology
3
572 - Biochemistry
3
690 - Buildings
3
155 - Differential & developmental psychology
2
301 - Sociology & anthropology
2
302 - Social interaction
2
331 - Labor economics
2
332 - Financial economics
2
333 - Economics of land & energy
2
344 - Labor, social, education & cultural law
2
379 - Public policy issues in education
2
518 - Numerical analysis
2
535 - Light & infrared & ultraviolet phenomena
2
537 - Electricity & electronics
2
more ...