Classification
330 - Economics
79
300 - Social sciences
74
900 - History & geography
70
519 - Probabilities & applied mathematics
61
610 - Medicine & health
49
320 - Political science
44
306 - Culture & institutions
41
620 - Engineering & allied operations
37
005 - Computer programming, programs & data
35
616 - Diseases
34
621 - Applied physics
34
340 - Law
32
301 - Sociology & anthropology
28
338 - Production
25
370 - Education
25
791 - Public performances
24
333 - Economics of land & energy
22
658 - General management
22
006 - Special computer methods
21
304 - Factors affecting social behavior
21
305 - Social groups
21
200 - Religion
20
551 - Geology, hydrology & meteorology
20
612 - Human physiology
20
700 - The arts; fine & decorative arts
20
615 - Pharmacology & therapeutics
18
363 - Other social problems & services
17
512 - Algebra
16
530 - Physics
16
001 - Knowledge
15
004 - Data processing & computer science
14
331 - Labor economics
14
570 - Life sciences; biology
13
302 - Social interaction
12
362 - Social welfare problems & services
12
600 - Technology
12
617 - Surgery & related medical specialties
12
378 - Higher education
11
515 - Analysis
11
572 - Biochemistry
11
780 - Music
11
297 - Islam, Babism & Bahai Faith
10
327 - International relations
10
364 - Criminology
10
500 - Natural sciences & mathematics
10
577 - Ecology
10
800 - Literature & rhetoric
10
003 - Systems
9
140 - Specific philosophical schools
9
303 - Social processes
9
more ...