Classification
140 - Specific philosophical schools
500 - Natural sciences & mathematics
620 - Engineering & allied operations
900 - History & geography
14
380 - Commerce, communications & transportation
12
700 - The arts; fine & decorative arts
12
600 - Technology
11
363 - Other social problems & services
10
540 - Chemistry & allied sciences
10
720 - Architecture
10
333 - Economics of land & energy
9
000 - Computer science, information & general works
8
576 - Genetics & evolution
7
590 - Animals (Zoology)
6
610 - Medicine & health
6
300 - Social sciences
5
320 - Political science
4
330 - Economics
4
340 - Law
4
551 - Geology, hydrology & meteorology
4
581 - Specific topics in natural history
4
414 - Phonology & phonetics
3
580 - Plants (Botany)
3
612 - Human physiology
3
370 - Education
2
400 - Language
2
170 - Ethics
1
530 - Physics
1
630 - Agriculture & related technologies
1
780 - Music
1