Classification
330 - Economics
600 - Technology
610 - Medicine & health
620 - Engineering & allied operations
32
900 - History & geography
333 - Economics of land & energy
19
700 - The arts; fine & decorative arts
17
363 - Other social problems & services
14
000 - Computer science, information & general works
9
370 - Education
8
380 - Commerce, communications & transportation
6
720 - Architecture
6
140 - Specific philosophical schools
5
320 - Political science
5
551 - Geology, hydrology & meteorology
4
576 - Genetics & evolution
4
580 - Plants (Botany)
4
630 - Agriculture & related technologies
4
170 - Ethics
3
100 - Philosophy & psychology
2
300 - Social sciences
2
500 - Natural sciences & mathematics
2
581 - Specific topics in natural history
2
658 - General management
2
800 - Literature & rhetoric
2
297 - Islam, Babism & Bahai Faith
1
360 - Social problems & services; associations
1
530 - Physics
1
540 - Chemistry & allied sciences
1
550 - Earth sciences
1
615 - Pharmacology & therapeutics
1
780 - Music
1