Classification
600 - Technology
620 - Engineering & allied operations
700 - The arts; fine & decorative arts
900 - History & geography
77
333 - Economics of land & energy
56
363 - Other social problems & services
37
330 - Economics
32
000 - Computer science, information & general works
28
380 - Commerce, communications & transportation
28
610 - Medicine & health
22
140 - Specific philosophical schools
21
720 - Architecture
21
576 - Genetics & evolution
20
580 - Plants (Botany)
14
320 - Political science
11
500 - Natural sciences & mathematics
11
340 - Law
8
370 - Education
7
630 - Agriculture & related technologies
7
658 - General management
6
400 - Language
5
551 - Geology, hydrology & meteorology
5
800 - Literature & rhetoric
5
100 - Philosophy & psychology
4
300 - Social sciences
4
414 - Phonology & phonetics
4
170 - Ethics
3
304 - Factors affecting social behavior
3
530 - Physics
3
361 - Social problems & social welfare in general
1
540 - Chemistry & allied sciences
1
581 - Specific topics in natural history
1
780 - Music
1