Classification
330 - Economics
80
340 - Law
31
612 - Human physiology
19
300 - Social sciences
17
320 - Political science
13
338 - Production
13
519 - Probabilities & applied mathematics
13
610 - Medicine & health
12
616 - Diseases
12
301 - Sociology & anthropology
11
332 - Financial economics
10
900 - History & geography
10
304 - Factors affecting social behavior
9
306 - Culture & institutions
8
331 - Labor economics
7
500 - Natural sciences & mathematics
7
510 - Mathematics
7
530 - Physics
7
100 - Philosophy & psychology
6
305 - Social groups
6
501 - Philosophy & theory
6
515 - Analysis
6
000 - Computer science, information & general works
5
380 - Commerce, communications & transportation
5
512 - Algebra
5
571 - Physiology & related subjects
5
576 - Genetics & evolution
5
617 - Surgery & related medical specialties
5
005 - Computer programming, programs & data
4
302 - Social interaction
4
339 - Macroeconomics & related topics
4
370 - Education
4
541 - Physical chemistry
4
551 - Geology, hydrology & meteorology
4
658 - General management
4
700 - The arts; fine & decorative arts
4
004 - Data processing & computer science
3
128 - Humankind
3
170 - Ethics
3
200 - Religion
3
307 - Communities
3
333 - Economics of land & energy
3
342 - Constitutional & administrative law
3
363 - Other social problems & services
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
more ...