Classification
000 - Computer science, information & general works
620 - Engineering & allied operations
720 - Architecture
600 - Technology
42
700 - The arts; fine & decorative arts
34
900 - History & geography
31
333 - Economics of land & energy
25
330 - Economics
20
363 - Other social problems & services
18
380 - Commerce, communications & transportation
14
580 - Plants (Botany)
12
630 - Agriculture & related technologies
12
610 - Medicine & health
11
140 - Specific philosophical schools
10
576 - Genetics & evolution
10
400 - Language
8
320 - Political science
6
500 - Natural sciences & mathematics
6
370 - Education
5
551 - Geology, hydrology & meteorology
5
800 - Literature & rhetoric
4
100 - Philosophy & psychology
3
170 - Ethics
3
414 - Phonology & phonetics
3
300 - Social sciences
2
410 - Linguistics
2
540 - Chemistry & allied sciences
2
658 - General management
2
120 - Epistemology, causation & humankind
1
297 - Islam, Babism & Bahai Faith
1
304 - Factors affecting social behavior
1
340 - Law
1
530 - Physics
1
770 - Photography, photographs & computer art
1
780 - Music
1