Classification
330 - Economics
380 - Commerce, communications & transportation
000 - Computer science, information & general works
147
333 - Economics of land & energy
75
700 - The arts; fine & decorative arts
59
363 - Other social problems & services
57
600 - Technology
54
320 - Political science
49
658 - General management
49
384 - Communications; telecommunication
41
900 - History & geography
37
140 - Specific philosophical schools
32
551 - Geology, hydrology & meteorology
26
610 - Medicine & health
25
620 - Engineering & allied operations
25
500 - Natural sciences & mathematics
21
370 - Education
19
576 - Genetics & evolution
18
300 - Social sciences
17
340 - Law
14
580 - Plants (Botany)
13
808 - Rhetoric & collections of literature
11
400 - Language
10
530 - Physics
10
630 - Agriculture & related technologies
10
720 - Architecture
10
800 - Literature & rhetoric
9
304 - Factors affecting social behavior
7
414 - Phonology & phonetics
7
519 - Probabilities & applied mathematics
7
581 - Specific topics in natural history
7
004 - Data processing & computer science
6
338 - Production
6
410 - Linguistics
6
100 - Philosophy & psychology
5
170 - Ethics
5
302 - Social interaction
5
651 - Office services
5
657 - Accounting
5
005 - Computer programming, programs & data
4
361 - Social problems & social welfare in general
4
540 - Chemistry & allied sciences
4
200 - Religion
3
297 - Islam, Babism & Bahai Faith
3
780 - Music
3
791 - Public performances
3
001 - Knowledge
2
150 - Psychology
2
153 - Mental processes & intelligence
2
158 - Applied psychology
2
more ...