Classification
530 - Physics
333 - Economics of land & energy
9
000 - Computer science, information & general works
8
700 - The arts; fine & decorative arts
8
330 - Economics
7
600 - Technology
7
620 - Engineering & allied operations
6
900 - History & geography
5
370 - Education
4
576 - Genetics & evolution
4
100 - Philosophy & psychology
3
320 - Political science
3
580 - Plants (Botany)
3
200 - Religion
2
300 - Social sciences
2
363 - Other social problems & services
2
380 - Commerce, communications & transportation
2
500 - Natural sciences & mathematics
2
540 - Chemistry & allied sciences
2
551 - Geology, hydrology & meteorology
2
610 - Medicine & health
2
630 - Agriculture & related technologies
2
658 - General management
2
720 - Architecture
2
140 - Specific philosophical schools
1
301 - Sociology & anthropology
1
340 - Law
1
350 - Public administration & military science
1
400 - Language
1
800 - Literature & rhetoric
1