Classification
330 - Economics
333 - Economics of land & energy
600 - Technology
900 - History & geography
620 - Engineering & allied operations
64
700 - The arts; fine & decorative arts
47
363 - Other social problems & services
26
380 - Commerce, communications & transportation
20
000 - Computer science, information & general works
17
610 - Medicine & health
16
370 - Education
14
580 - Plants (Botany)
14
320 - Political science
10
140 - Specific philosophical schools
9
500 - Natural sciences & mathematics
8
630 - Agriculture & related technologies
8
658 - General management
8
576 - Genetics & evolution
5
720 - Architecture
5
340 - Law
4
414 - Phonology & phonetics
4
551 - Geology, hydrology & meteorology
4
304 - Factors affecting social behavior
3
400 - Language
3
581 - Specific topics in natural history
3
800 - Literature & rhetoric
3
300 - Social sciences
2
301 - Sociology & anthropology
2
540 - Chemistry & allied sciences
2
170 - Ethics
1
297 - Islam, Babism & Bahai Faith
1
530 - Physics
1
780 - Music
1