Classification
600 - Technology
620 - Engineering & allied operations
700 - The arts; fine & decorative arts
900 - History & geography
33
333 - Economics of land & energy
23
363 - Other social problems & services
23
330 - Economics
15
610 - Medicine & health
15
000 - Computer science, information & general works
12
720 - Architecture
10
380 - Commerce, communications & transportation
9
630 - Agriculture & related technologies
9
580 - Plants (Botany)
8
140 - Specific philosophical schools
7
320 - Political science
6
370 - Education
6
300 - Social sciences
5
576 - Genetics & evolution
5
800 - Literature & rhetoric
5
340 - Law
4
500 - Natural sciences & mathematics
4
551 - Geology, hydrology & meteorology
4
170 - Ethics
3
540 - Chemistry & allied sciences
3
658 - General management
3
100 - Philosophy & psychology
2
400 - Language
2
414 - Phonology & phonetics
2
530 - Physics
2
301 - Sociology & anthropology
1
304 - Factors affecting social behavior
1
336 - Public finance
1
361 - Social problems & social welfare in general
1
550 - Earth sciences
1
581 - Specific topics in natural history
1
780 - Music
1