Classification
140 - Specific philosophical schools
330 - Economics
600 - Technology
610 - Medicine & health
700 - The arts; fine & decorative arts
21
333 - Economics of land & energy
15
000 - Computer science, information & general works
14
620 - Engineering & allied operations
13
363 - Other social problems & services
12
380 - Commerce, communications & transportation
11
900 - History & geography
8
630 - Agriculture & related technologies
6
658 - General management
6
300 - Social sciences
5
320 - Political science
4
340 - Law
3
361 - Social problems & social welfare in general
3
370 - Education
3
500 - Natural sciences & mathematics
3
800 - Literature & rhetoric
3
100 - Philosophy & psychology
2
170 - Ethics
2
301 - Sociology & anthropology
2
304 - Factors affecting social behavior
2
400 - Language
2
551 - Geology, hydrology & meteorology
2
580 - Plants (Botany)
2
581 - Specific topics in natural history
2
720 - Architecture
2
200 - Religion
1
297 - Islam, Babism & Bahai Faith
1
338 - Production
1
350 - Public administration & military science
1
364 - Criminology
1
550 - Earth sciences
1
576 - Genetics & evolution
1
612 - Human physiology
1