Classification
330 - Economics
78
300 - Social sciences
73
900 - History & geography
70
519 - Probabilities & applied mathematics
61
610 - Medicine & health
47
320 - Political science
43
306 - Culture & institutions
40
620 - Engineering & allied operations
37
005 - Computer programming, programs & data
35
616 - Diseases
34
621 - Applied physics
34
340 - Law
32
301 - Sociology & anthropology
27
338 - Production
25
791 - Public performances
24
370 - Education
23
304 - Factors affecting social behavior
21
305 - Social groups
21
333 - Economics of land & energy
21
658 - General management
21
006 - Special computer methods
20
200 - Religion
20
551 - Geology, hydrology & meteorology
20
612 - Human physiology
20
700 - The arts; fine & decorative arts
20
363 - Other social problems & services
17
530 - Physics
17
001 - Knowledge
16
512 - Algebra
16
004 - Data processing & computer science
14
331 - Labor economics
14
615 - Pharmacology & therapeutics
14
570 - Life sciences; biology
13
302 - Social interaction
12
617 - Surgery & related medical specialties
12
362 - Social welfare problems & services
11
515 - Analysis
11
572 - Biochemistry
11
600 - Technology
11
780 - Music
11
364 - Criminology
10
378 - Higher education
10
500 - Natural sciences & mathematics
10
800 - Literature & rhetoric
10
003 - Systems
9
140 - Specific philosophical schools
9
297 - Islam, Babism & Bahai Faith
9
303 - Social processes
9
327 - International relations
9
332 - Financial economics
9
more ...