Classification
900 - History & geography
600 - Technology
27
620 - Engineering & allied operations
27
700 - The arts; fine & decorative arts
21
300 - Social sciences
11
363 - Other social problems & services
10
333 - Economics of land & energy
9
340 - Law
8
576 - Genetics & evolution
8
000 - Computer science, information & general works
6
380 - Commerce, communications & transportation
6
320 - Political science
5
414 - Phonology & phonetics
5
500 - Natural sciences & mathematics
5
720 - Architecture
5
140 - Specific philosophical schools
4
330 - Economics
4
630 - Agriculture & related technologies
4
780 - Music
3
370 - Education
2
610 - Medicine & health
2
800 - Literature & rhetoric
2
100 - Philosophy & psychology
1
301 - Sociology & anthropology
1
400 - Language
1
410 - Linguistics
1
530 - Physics
1
551 - Geology, hydrology & meteorology
1
580 - Plants (Botany)
1
581 - Specific topics in natural history
1