Classification
720 - Architecture
700 - The arts; fine & decorative arts
31
600 - Technology
27
333 - Economics of land & energy
25
363 - Other social problems & services
25
000 - Computer science, information & general works
21
330 - Economics
20
620 - Engineering & allied operations
20
900 - History & geography
20
580 - Plants (Botany)
15
380 - Commerce, communications & transportation
14
610 - Medicine & health
14
140 - Specific philosophical schools
10
551 - Geology, hydrology & meteorology
8
630 - Agriculture & related technologies
8
800 - Literature & rhetoric
7
340 - Law
6
320 - Political science
5
576 - Genetics & evolution
5
658 - General management
5
170 - Ethics
4
300 - Social sciences
4
370 - Education
4
657 - Accounting
4
696 - Utilities
4
100 - Philosophy & psychology
3
500 - Natural sciences & mathematics
3
200 - Religion
2
297 - Islam, Babism & Bahai Faith
2
581 - Specific topics in natural history
2
780 - Music
2
296 - Judaism
1
301 - Sociology & anthropology
1
304 - Factors affecting social behavior
1
414 - Phonology & phonetics
1
530 - Physics
1
550 - Earth sciences
1
612 - Human physiology
1
745 - Decorative arts
1