Classification
600 - Technology
330 - Economics
202
620 - Engineering & allied operations
156
610 - Medicine & health
122
333 - Economics of land & energy
121
363 - Other social problems & services
103
320 - Political science
95
000 - Computer science, information & general works
87
900 - History & geography
84
700 - The arts; fine & decorative arts
83
630 - Agriculture & related technologies
77
370 - Education
65
380 - Commerce, communications & transportation
44
500 - Natural sciences & mathematics
32
140 - Specific philosophical schools
30
551 - Geology, hydrology & meteorology
27
580 - Plants (Botany)
26
300 - Social sciences
25
304 - Factors affecting social behavior
24
340 - Law
22
581 - Specific topics in natural history
21
170 - Ethics
18
576 - Genetics & evolution
13
100 - Philosophy & psychology
12
540 - Chemistry & allied sciences
10
658 - General management
10
200 - Religion
6
301 - Sociology & anthropology
5
361 - Social problems & social welfare in general
5
400 - Language
5
800 - Literature & rhetoric
5
660 - Chemical engineering
4
360 - Social problems & services; associations
3
410 - Linguistics
3
780 - Music
3
297 - Islam, Babism & Bahai Faith
2
338 - Production
2
350 - Public administration & military science
2
362 - Social welfare problems & services
2
530 - Physics
2
612 - Human physiology
2
615 - Pharmacology & therapeutics
2
720 - Architecture
2
791 - Public performances
2
001 - Knowledge
1
005 - Computer programming, programs & data
1
120 - Epistemology, causation & humankind
1
174 - Occupational ethics
1
305 - Social groups
1
327 - International relations
1
more ...