Classification
333 - Economics of land & energy
330 - Economics
328
320 - Political science
256
363 - Other social problems & services
229
338 - Production
198
700 - The arts; fine & decorative arts
179
600 - Technology
176
000 - Computer science, information & general works
117
620 - Engineering & allied operations
104
900 - History & geography
104
551 - Geology, hydrology & meteorology
97
370 - Education
90
610 - Medicine & health
90
380 - Commerce, communications & transportation
88
140 - Specific philosophical schools
72
630 - Agriculture & related technologies
68
581 - Specific topics in natural history
65
300 - Social sciences
60
340 - Law
50
100 - Philosophy & psychology
38
580 - Plants (Botany)
38
658 - General management
29
720 - Architecture
29
576 - Genetics & evolution
27
304 - Factors affecting social behavior
26
500 - Natural sciences & mathematics
24
361 - Social problems & social welfare in general
14
301 - Sociology & anthropology
13
400 - Language
13
800 - Literature & rhetoric
12
200 - Religion
11
350 - Public administration & military science
11
530 - Physics
11
170 - Ethics
10
540 - Chemistry & allied sciences
9
410 - Linguistics
8
657 - Accounting
7
297 - Islam, Babism & Bahai Faith
6
336 - Public finance
3
360 - Social problems & services; associations
3
414 - Phonology & phonetics
3
621 - Applied physics
3
780 - Music
3
120 - Epistemology, causation & humankind
2
302 - Social interaction
2
364 - Criminology
2
381 - Commerce
2
520 - Astronomy & allied sciences
2
550 - Earth sciences
2
153 - Mental processes & intelligence
1
more ...