Classification
330 - Economics
333 - Economics of land & energy
320 - Political science
663
363 - Other social problems & services
512
600 - Technology
445
700 - The arts; fine & decorative arts
368
000 - Computer science, information & general works
291
620 - Engineering & allied operations
245
610 - Medicine & health
231
900 - History & geography
229
380 - Commerce, communications & transportation
226
140 - Specific philosophical schools
135
551 - Geology, hydrology & meteorology
132
370 - Education
126
304 - Factors affecting social behavior
123
630 - Agriculture & related technologies
122
580 - Plants (Botany)
98
658 - General management
81
340 - Law
74
581 - Specific topics in natural history
73
300 - Social sciences
62
576 - Genetics & evolution
57
500 - Natural sciences & mathematics
54
100 - Philosophy & psychology
47
336 - Public finance
42
720 - Architecture
40
540 - Chemistry & allied sciences
34
170 - Ethics
32
800 - Literature & rhetoric
31
530 - Physics
28
361 - Social problems & social welfare in general
26
400 - Language
24
301 - Sociology & anthropology
20
657 - Accounting
18
200 - Religion
17
350 - Public administration & military science
14
410 - Linguistics
14
414 - Phonology & phonetics
12
297 - Islam, Babism & Bahai Faith
11
612 - Human physiology
8
332 - Financial economics
7
360 - Social problems & services; associations
5
650 - Management & auxiliary services
5
780 - Music
5
520 - Astronomy & allied sciences
4
158 - Applied psychology
3
331 - Labor economics
3
381 - Commerce
3
550 - Earth sciences
3
770 - Photography, photographs & computer art
3
more ...