Classification
600 - Technology
000 - Computer science, information & general works
56
700 - The arts; fine & decorative arts
56
620 - Engineering & allied operations
52
900 - History & geography
47
333 - Economics of land & energy
26
610 - Medicine & health
22
363 - Other social problems & services
21
400 - Language
20
380 - Commerce, communications & transportation
19
140 - Specific philosophical schools
18
330 - Economics
17
720 - Architecture
13
576 - Genetics & evolution
11
370 - Education
10
630 - Agriculture & related technologies
9
320 - Political science
7
410 - Linguistics
7
658 - General management
7
500 - Natural sciences & mathematics
6
580 - Plants (Botany)
6
800 - Literature & rhetoric
6
300 - Social sciences
5
551 - Geology, hydrology & meteorology
5
304 - Factors affecting social behavior
3
170 - Ethics
2
340 - Law
2
414 - Phonology & phonetics
2
530 - Physics
2
770 - Photography, photographs & computer art
2
100 - Philosophy & psychology
1
120 - Epistemology, causation & humankind
1
550 - Earth sciences
1
581 - Specific topics in natural history
1
657 - Accounting
1
780 - Music
1