Classification
000 - Computer science, information & general works
380 - Commerce, communications & transportation
700 - The arts; fine & decorative arts
243
600 - Technology
209
333 - Economics of land & energy
203
330 - Economics
188
363 - Other social problems & services
135
620 - Engineering & allied operations
123
610 - Medicine & health
117
900 - History & geography
108
140 - Specific philosophical schools
89
320 - Political science
87
658 - General management
78
580 - Plants (Botany)
65
551 - Geology, hydrology & meteorology
59
576 - Genetics & evolution
55
370 - Education
54
384 - Communications; telecommunication
54
500 - Natural sciences & mathematics
46
530 - Physics
42
540 - Chemistry & allied sciences
40
300 - Social sciences
38
340 - Law
34
400 - Language
32
630 - Agriculture & related technologies
31
720 - Architecture
28
414 - Phonology & phonetics
27
800 - Literature & rhetoric
23
581 - Specific topics in natural history
20
100 - Philosophy & psychology
18
410 - Linguistics
17
304 - Factors affecting social behavior
15
612 - Human physiology
15
302 - Social interaction
13
170 - Ethics
12
381 - Commerce
12
301 - Sociology & anthropology
11
808 - Rhetoric & collections of literature
10
338 - Production
9
780 - Music
8
331 - Labor economics
7
361 - Social problems & social welfare in general
7
791 - Public performances
7
200 - Religion
6
657 - Accounting
6
550 - Earth sciences
5
650 - Management & auxiliary services
4
153 - Mental processes & intelligence
3
158 - Applied psychology
3
297 - Islam, Babism & Bahai Faith
3
more ...