Classification
330 - Economics
99
320 - Political science
85
004 - Data processing & computer science
38
006 - Special computer methods
38
005 - Computer programming, programs & data
28
304 - Factors affecting social behavior
18
820 - English & Old English literatures
18
300 - Social sciences
16
333 - Economics of land & energy
15
340 - Law
13
900 - History & geography
13
610 - Medicine & health
12
306 - Culture & institutions
10
551 - Geology, hydrology & meteorology
10
577 - Ecology
10
616 - Diseases
10
658 - General management
10
910 - Geography & travel
9
040 - [Unassigned]
8
338 - Production
8
518 - Numerical analysis
8
630 - Agriculture & related technologies
8
003 - Systems
7
515 - Analysis
7
620 - Engineering & allied operations
7
621 - Applied physics
7
629 - Other branches of engineering
6
930 - History of ancient world to ca. 499
6
001 - Knowledge
5
025 - Library operations
5
331 - Labor economics
5
332 - Financial economics
5
570 - Life sciences; biology
5
305 - Social groups
4
327 - International relations
4
363 - Other social problems & services
4
364 - Criminology
4
370 - Education
4
371 - Schools & their activities; special education
4
510 - Mathematics
4
550 - Earth sciences
4
380 - Commerce, communications & transportation
3
580 - Plants (Botany)
3
600 - Technology
3
612 - Human physiology
3
617 - Surgery & related medical specialties
3
634 - Orchards, fruits & forestry
3
691 - Building materials
3
170 - Ethics
2
307 - Communities
2
more ...