Classification
330 - Economics
600 - Technology
30
620 - Engineering & allied operations
700 - The arts; fine & decorative arts
900 - History & geography
21
333 - Economics of land & energy
18
000 - Computer science, information & general works
13
580 - Plants (Botany)
8
576 - Genetics & evolution
7
380 - Commerce, communications & transportation
6
720 - Architecture
6
363 - Other social problems & services
5
610 - Medicine & health
5
500 - Natural sciences & mathematics
4
140 - Specific philosophical schools
3
414 - Phonology & phonetics
3
630 - Agriculture & related technologies
3
320 - Political science
2
340 - Law
2
551 - Geology, hydrology & meteorology
2
658 - General management
2
540 - Chemistry & allied sciences
1