Classification
600 - Technology
700 - The arts; fine & decorative arts
620 - Engineering & allied operations
100
900 - History & geography
91
333 - Economics of land & energy
67
000 - Computer science, information & general works
57
610 - Medicine & health
40
380 - Commerce, communications & transportation
35
330 - Economics
34
363 - Other social problems & services
34
576 - Genetics & evolution
29
140 - Specific philosophical schools
27
580 - Plants (Botany)
19
630 - Agriculture & related technologies
18
720 - Architecture
15
340 - Law
13
500 - Natural sciences & mathematics
13
320 - Political science
11
551 - Geology, hydrology & meteorology
8
581 - Specific topics in natural history
8
530 - Physics
6
540 - Chemistry & allied sciences
5
304 - Factors affecting social behavior
4
370 - Education
4
414 - Phonology & phonetics
4
658 - General management
4
800 - Literature & rhetoric
4
170 - Ethics
3
300 - Social sciences
3
400 - Language
3
100 - Philosophy & psychology
2
361 - Social problems & social welfare in general
2
612 - Human physiology
2
350 - Public administration & military science
1
410 - Linguistics
1
780 - Music
1