Classification
320 - Political science
32
330 - Economics
26
900 - History & geography
19
300 - Social sciences
15
004 - Data processing & computer science
11
658 - General management
11
005 - Computer programming, programs & data
8
340 - Law
8
510 - Mathematics
8
006 - Special computer methods
7
301 - Sociology & anthropology
7
530 - Physics
7
700 - The arts; fine & decorative arts
6
304 - Factors affecting social behavior
5
333 - Economics of land & energy
5
610 - Medicine & health
5
620 - Engineering & allied operations
5
000 - Computer science, information & general works
4
120 - Epistemology, causation & humankind
4
338 - Production
4
720 - Architecture
4
306 - Culture & institutions
3
370 - Education
3
509 - Historical, geographic & persons treatment
3
512 - Algebra
3
616 - Diseases
3
621 - Applied physics
3
629 - Other branches of engineering
3
630 - Agriculture & related technologies
3
970 - History of North America
3
100 - Philosophy & psychology
2
170 - Ethics
2
200 - Religion
2
371 - Schools & their activities; special education
2
500 - Natural sciences & mathematics
2
501 - Philosophy & theory
2
516 - Geometry
2
577 - Ecology
2
600 - Technology
2
670 - Manufacturing
2
003 - Systems
1
153 - Mental processes & intelligence
1
240 - Christian moral & devotional theology
1
297 - Islam, Babism & Bahai Faith
1
302 - Social interaction
1
327 - International relations
1
331 - Labor economics
1
363 - Other social problems & services
1
364 - Criminology
1
515 - Analysis
1
more ...