Classification
330 - Economics
165
333 - Economics of land & energy
121
700 - The arts; fine & decorative arts
112
600 - Technology
111
610 - Medicine & health
104
658 - General management
102
000 - Computer science, information & general works
93
363 - Other social problems & services
82
900 - History & geography
77
320 - Political science
71
620 - Engineering & allied operations
71
140 - Specific philosophical schools
62
380 - Commerce, communications & transportation
61
370 - Education
55
100 - Philosophy & psychology
53
300 - Social sciences
50
302 - Social interaction
49
500 - Natural sciences & mathematics
31
576 - Genetics & evolution
26
340 - Law
24
170 - Ethics
23
361 - Social problems & social welfare in general
20
580 - Plants (Botany)
19
720 - Architecture
17
400 - Language
15
551 - Geology, hydrology & meteorology
15
800 - Literature & rhetoric
14
581 - Specific topics in natural history
12
630 - Agriculture & related technologies
12
612 - Human physiology
11
301 - Sociology & anthropology
10
657 - Accounting
10
304 - Factors affecting social behavior
9
305 - Social groups
9
530 - Physics
8
540 - Chemistry & allied sciences
8
780 - Music
8
200 - Religion
7
414 - Phonology & phonetics
7
158 - Applied psychology
6
410 - Linguistics
5
650 - Management & auxiliary services
5
280 - Christian denominations & sects
4
331 - Labor economics
4
338 - Production
4
350 - Public administration & military science
4
160 - Logic
3
297 - Islam, Babism & Bahai Faith
3
336 - Public finance
3
339 - Macroeconomics & related topics
3
more ...