Classification
330 - Economics
79
340 - Law
31
612 - Human physiology
19
300 - Social sciences
16
519 - Probabilities & applied mathematics
13
320 - Political science
12
338 - Production
12
610 - Medicine & health
12
616 - Diseases
12
301 - Sociology & anthropology
11
332 - Financial economics
10
900 - History & geography
9
304 - Factors affecting social behavior
8
306 - Culture & institutions
8
140 - Specific philosophical schools
7
331 - Labor economics
7
500 - Natural sciences & mathematics
7
510 - Mathematics
7
530 - Physics
7
501 - Philosophy & theory
6
515 - Analysis
6
000 - Computer science, information & general works
5
100 - Philosophy & psychology
5
305 - Social groups
5
380 - Commerce, communications & transportation
5
571 - Physiology & related subjects
5
617 - Surgery & related medical specialties
5
005 - Computer programming, programs & data
4
339 - Macroeconomics & related topics
4
512 - Algebra
4
541 - Physical chemistry
4
551 - Geology, hydrology & meteorology
4
576 - Genetics & evolution
4
700 - The arts; fine & decorative arts
4
004 - Data processing & computer science
3
128 - Humankind
3
200 - Religion
3
302 - Social interaction
3
342 - Constitutional & administrative law
3
363 - Other social problems & services
3
370 - Education
3
382 - International commerce
3
509 - Historical, geographic & persons treatment
3
531 - Classical mechanics; solid mechanics
3
540 - Chemistry & allied sciences
3
570 - Life sciences; biology
3
613 - Personal health & safety
3
620 - Engineering & allied operations
3
650 - Management & auxiliary services
3
658 - General management
3
more ...