Classification
333 - Economics of land & energy
530 - Physics
700 - The arts; fine & decorative arts
620 - Engineering & allied operations
21
600 - Technology
15
000 - Computer science, information & general works
13
900 - History & geography
11
500 - Natural sciences & mathematics
6
340 - Law
5
380 - Commerce, communications & transportation
5
540 - Chemistry & allied sciences
5
363 - Other social problems & services
4
551 - Geology, hydrology & meteorology
4
320 - Political science
3
330 - Economics
3
370 - Education
3
610 - Medicine & health
3
140 - Specific philosophical schools
2
414 - Phonology & phonetics
2
800 - Literature & rhetoric
2
170 - Ethics
1
300 - Social sciences
1
400 - Language
1
576 - Genetics & evolution
1
580 - Plants (Botany)
1
581 - Specific topics in natural history
1
630 - Agriculture & related technologies
1