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