Classification
500 - Natural sciences & mathematics
700 - The arts; fine & decorative arts
000 - Computer science, information & general works
18
333 - Economics of land & energy
13
600 - Technology
9
330 - Economics
7
610 - Medicine & health
6
363 - Other social problems & services
5
576 - Genetics & evolution
5
580 - Plants (Botany)
5
620 - Engineering & allied operations
5
140 - Specific philosophical schools
4
380 - Commerce, communications & transportation
4
551 - Geology, hydrology & meteorology
4
658 - General management
4
800 - Literature & rhetoric
4
900 - History & geography
4
320 - Political science
3
340 - Law
3
630 - Agriculture & related technologies
3
400 - Language
2
414 - Phonology & phonetics
2
720 - Architecture
2
170 - Ethics
1
300 - Social sciences
1
370 - Education
1
530 - Physics
1
540 - Chemistry & allied sciences
1
780 - Music
1