Classification
380 - Commerce, communications & transportation
330 - Economics
75
333 - Economics of land & energy
52
700 - The arts; fine & decorative arts
46
000 - Computer science, information & general works
44
600 - Technology
44
658 - General management
41
320 - Political science
34
363 - Other social problems & services
32
370 - Education
29
384 - Communications; telecommunication
25
610 - Medicine & health
24
900 - History & geography
21
140 - Specific philosophical schools
20
620 - Engineering & allied operations
19
300 - Social sciences
17
338 - Production
16
551 - Geology, hydrology & meteorology
14
720 - Architecture
14
576 - Genetics & evolution
13
302 - Social interaction
12
500 - Natural sciences & mathematics
6
581 - Specific topics in natural history
6
580 - Plants (Botany)
5
630 - Agriculture & related technologies
5
791 - Public performances
5
800 - Literature & rhetoric
5
340 - Law
4
297 - Islam, Babism & Bahai Faith
3
304 - Factors affecting social behavior
3
331 - Labor economics
3
410 - Linguistics
3
006 - Special computer methods
2
158 - Applied psychology
2
200 - Religion
2
520 - Astronomy & allied sciences
2
530 - Physics
2
650 - Management & auxiliary services
2
100 - Philosophy & psychology
1
160 - Logic
1
170 - Ethics
1
332 - Financial economics
1
350 - Public administration & military science
1
361 - Social problems & social welfare in general
1
364 - Criminology
1
400 - Language
1
414 - Phonology & phonetics
1
540 - Chemistry & allied sciences
1
550 - Earth sciences
1
651 - Office services
1
more ...