Classification
700 - The arts; fine & decorative arts
73
600 - Technology
66
000 - Computer science, information & general works
55
620 - Engineering & allied operations
48
333 - Economics of land & energy
46
900 - History & geography
40
330 - Economics
34
380 - Commerce, communications & transportation
31
320 - Political science
26
363 - Other social problems & services
23
576 - Genetics & evolution
22
500 - Natural sciences & mathematics
21
610 - Medicine & health
21
140 - Specific philosophical schools
20
580 - Plants (Botany)
14
530 - Physics
13
340 - Law
12
630 - Agriculture & related technologies
12
800 - Literature & rhetoric
11
100 - Philosophy & psychology
10
540 - Chemistry & allied sciences
10
370 - Education
9
658 - General management
9
551 - Geology, hydrology & meteorology
8
300 - Social sciences
7
720 - Architecture
7
400 - Language
6
414 - Phonology & phonetics
6
514 - Topology
6
170 - Ethics
5
200 - Religion
5
410 - Linguistics
5
304 - Factors affecting social behavior
3
612 - Human physiology
3
780 - Music
3
297 - Islam, Babism & Bahai Faith
2
301 - Sociology & anthropology
2
361 - Social problems & social welfare in general
2
510 - Mathematics
2
515 - Analysis
2
520 - Astronomy & allied sciences
2
621 - Applied physics
2
001 - Knowledge
1
006 - Special computer methods
1
110 - Metaphysics
1
115 - Time
1
160 - Logic
1
336 - Public finance
1
350 - Public administration & military science
1
512 - Algebra
1
more ...