Classification
330 - Economics
77
520 - Astronomy & allied sciences
39
332 - Financial economics
29
519 - Probabilities & applied mathematics
26
658 - General management
16
500 - Natural sciences & mathematics
15
333 - Economics of land & energy
13
300 - Social sciences
12
006 - Special computer methods
11
000 - Computer science, information & general works
10
530 - Physics
10
004 - Data processing & computer science
8
523 - Specific celestial bodies & phenomena
8
338 - Production
7
368 - Insurance
7
510 - Mathematics
7
600 - Technology
7
700 - The arts; fine & decorative arts
7
339 - Macroeconomics & related topics
5
380 - Commerce, communications & transportation
5
620 - Engineering & allied operations
5
005 - Computer programming, programs & data
4
320 - Political science
4
518 - Numerical analysis
4
363 - Other social problems & services
3
576 - Genetics & evolution
3
621 - Applied physics
3
001 - Knowledge
2
003 - Systems
2
302 - Social interaction
2
336 - Public finance
2
337 - International economics
2
340 - Law
2
361 - Social problems & social welfare in general
2
539 - Modern physics
2
550 - Earth sciences
2
628 - Sanitary & municipal engineering
2
650 - Management & auxiliary services
2
670 - Manufacturing
2
900 - History & geography
2
100 - Philosophy & psychology
1
153 - Mental processes & intelligence
1
174 - Occupational ethics
1
327 - International relations
1
350 - Public administration & military science
1
410 - Linguistics
1
511 - General principles of mathematics
1
515 - Analysis
1
516 - Geometry
1
610 - Medicine & health
1
more ...