Classification
620 - Engineering & allied operations
900 - History & geography
600 - Technology
153
700 - The arts; fine & decorative arts
99
333 - Economics of land & energy
66
363 - Other social problems & services
46
000 - Computer science, information & general works
44
380 - Commerce, communications & transportation
43
330 - Economics
35
610 - Medicine & health
35
140 - Specific philosophical schools
25
580 - Plants (Botany)
23
320 - Political science
19
500 - Natural sciences & mathematics
17
720 - Architecture
16
576 - Genetics & evolution
15
340 - Law
12
658 - General management
12
370 - Education
11
414 - Phonology & phonetics
9
551 - Geology, hydrology & meteorology
9
630 - Agriculture & related technologies
8
400 - Language
7
530 - Physics
6
304 - Factors affecting social behavior
5
540 - Chemistry & allied sciences
5
410 - Linguistics
4
780 - Music
3
100 - Philosophy & psychology
2
300 - Social sciences
2
550 - Earth sciences
2
581 - Specific topics in natural history
2
612 - Human physiology
2
800 - Literature & rhetoric
2
200 - Religion
1
297 - Islam, Babism & Bahai Faith
1
360 - Social problems & services; associations
1