Classification
330 - Economics
29
006 - Special computer methods
23
320 - Political science
16
005 - Computer programming, programs & data
12
658 - General management
12
304 - Factors affecting social behavior
10
820 - English & Old English literatures
9
297 - Islam, Babism & Bahai Faith
8
600 - Technology
8
900 - History & geography
8
000 - Computer science, information & general works
7
720 - Architecture
7
940 - History of Europe
7
302 - Social interaction
6
306 - Culture & institutions
6
333 - Economics of land & energy
6
363 - Other social problems & services
6
004 - Data processing & computer science
5
301 - Sociology & anthropology
5
620 - Engineering & allied operations
5
700 - The arts; fine & decorative arts
5
200 - Religion
4
290 - Other religions
4
381 - Commerce
4
550 - Earth sciences
4
551 - Geology, hydrology & meteorology
4
630 - Agriculture & related technologies
4
300 - Social sciences
3
305 - Social groups
3
307 - Communities
3
331 - Labor economics
3
340 - Law
3
341 - Law of nations
3
490 - Other languages
3
571 - Physiology & related subjects
3
696 - Utilities
3
745 - Decorative arts
3
001 - Knowledge
2
100 - Philosophy & psychology
2
170 - Ethics
2
327 - International relations
2
338 - Production
2
370 - Education
2
418 - Standard usage & applied linguistics
2
577 - Ecology
2
580 - Plants (Botany)
2
581 - Specific topics in natural history
2
610 - Medicine & health
2
616 - Diseases
2
621 - Applied physics
2
more ...