Classification
620 - Engineering & allied operations
115
005 - Computer programming, programs & data
104
650 - Management & auxiliary services
79
300 - Social sciences
72
658 - General management
71
616 - Diseases
43
004 - Data processing & computer science
41
330 - Economics
32
320 - Political science
29
621 - Applied physics
28
500 - Natural sciences & mathematics
22
515 - Analysis
18
530 - Physics
18
006 - Special computer methods
17
510 - Mathematics
17
617 - Surgery & related medical specialties
17
301 - Sociology & anthropology
16
610 - Medicine & health
16
770 - Photography, photographs & computer art
16
340 - Law
13
519 - Probabilities & applied mathematics
13
332 - Financial economics
11
512 - Algebra
11
333 - Economics of land & energy
10
370 - Education
10
516 - Geometry
10
302 - Social interaction
9
331 - Labor economics
9
771 - Techniques, equipment & materials
9
150 - Psychology
8
629 - Other branches of engineering
8
142 - Critical philosophy
7
338 - Production
7
551 - Geology, hydrology & meteorology
7
745 - Decorative arts
7
001 - Knowledge
6
536 - Heat
6
541 - Physical chemistry
6
624 - Civil engineering
6
657 - Accounting
6
000 - Computer science, information & general works
5
306 - Culture & institutions
5
618 - Gynecology, obstetrics, pediatrics & geriatrics
5
003 - Systems
4
158 - Applied psychology
4
305 - Social groups
4
410 - Linguistics
4
531 - Classical mechanics; solid mechanics
4
540 - Chemistry & allied sciences
4
570 - Life sciences; biology
4
more ...