Classification
320 - Political science
700 - The arts; fine & decorative arts
330 - Economics
306
600 - Technology
93
900 - History & geography
56
333 - Economics of land & energy
52
630 - Agriculture & related technologies
43
000 - Computer science, information & general works
42
363 - Other social problems & services
42
300 - Social sciences
32
380 - Commerce, communications & transportation
28
620 - Engineering & allied operations
27
140 - Specific philosophical schools
20
340 - Law
19
610 - Medicine & health
17
370 - Education
16
551 - Geology, hydrology & meteorology
15
720 - Architecture
14
576 - Genetics & evolution
11
800 - Literature & rhetoric
10
658 - General management
9
500 - Natural sciences & mathematics
8
581 - Specific topics in natural history
8
580 - Plants (Botany)
6
100 - Philosophy & psychology
5
414 - Phonology & phonetics
5
301 - Sociology & anthropology
4
304 - Factors affecting social behavior
4
361 - Social problems & social welfare in general
4
400 - Language
4
530 - Physics
4
657 - Accounting
4
791 - Public performances
4
160 - Logic
3
170 - Ethics
3
297 - Islam, Babism & Bahai Faith
3
410 - Linguistics
3
770 - Photography, photographs & computer art
3
780 - Music
3
360 - Social problems & services; associations
2
540 - Chemistry & allied sciences
2
200 - Religion
1
338 - Production
1
350 - Public administration & military science
1
520 - Astronomy & allied sciences
1
603 - Dictionaries & encyclopedias
1
650 - Management & auxiliary services
1