Classification
340 - Law
32
004 - Data processing & computer science
31
330 - Economics
28
320 - Political science
20
616 - Diseases
18
005 - Computer programming, programs & data
17
301 - Sociology & anthropology
16
620 - Engineering & allied operations
15
006 - Special computer methods
12
610 - Medicine & health
10
519 - Probabilities & applied mathematics
8
658 - General management
8
300 - Social sciences
7
370 - Education
7
570 - Life sciences; biology
7
900 - History & geography
7
306 - Culture & institutions
6
332 - Financial economics
6
530 - Physics
6
001 - Knowledge
5
338 - Production
5
371 - Schools & their activities; special education
5
547 - Organic chemistry
5
612 - Human physiology
5
153 - Mental processes & intelligence
4
304 - Factors affecting social behavior
4
331 - Labor economics
4
333 - Economics of land & energy
4
363 - Other social problems & services
4
302 - Social interaction
3
305 - Social groups
3
364 - Criminology
3
501 - Philosophy & theory
3
539 - Modern physics
3
540 - Chemistry & allied sciences
3
543 - Analytical chemistry
3
571 - Physiology & related subjects
3
617 - Surgery & related medical specialties
3
700 - The arts; fine & decorative arts
3
000 - Computer science, information & general works
2
003 - Systems
2
140 - Specific philosophical schools
2
230 - Christianity & Christian theology
2
296 - Judaism
2
297 - Islam, Babism & Bahai Faith
2
307 - Communities
2
378 - Higher education
2
510 - Mathematics
2
516 - Geometry
2
518 - Numerical analysis
2
more ...