Classification
330 - Economics
333 - Economics of land & energy
46
320 - Political science
27
700 - The arts; fine & decorative arts
23
600 - Technology
18
140 - Specific philosophical schools
17
370 - Education
17
363 - Other social problems & services
15
610 - Medicine & health
15
380 - Commerce, communications & transportation
13
900 - History & geography
13
340 - Law
12
000 - Computer science, information & general works
11
300 - Social sciences
10
304 - Factors affecting social behavior
8
576 - Genetics & evolution
7
100 - Philosophy & psychology
6
170 - Ethics
6
200 - Religion
6
620 - Engineering & allied operations
6
551 - Geology, hydrology & meteorology
5
361 - Social problems & social welfare in general
4
500 - Natural sciences & mathematics
4
581 - Specific topics in natural history
3
658 - General management
3
297 - Islam, Babism & Bahai Faith
2
350 - Public administration & military science
2
410 - Linguistics
2
530 - Physics
2
630 - Agriculture & related technologies
2
301 - Sociology & anthropology
1
336 - Public finance
1
360 - Social problems & services; associations
1
364 - Criminology
1
400 - Language
1
510 - Mathematics
1
515 - Analysis
1
540 - Chemistry & allied sciences
1
612 - Human physiology
1
770 - Photography, photographs & computer art
1
780 - Music
1
800 - Literature & rhetoric
1