Classification
330 - Economics
380 - Commerce, communications & transportation
600 - Technology
700 - The arts; fine & decorative arts
900 - History & geography
620 - Engineering & allied operations
39
333 - Economics of land & energy
33
363 - Other social problems & services
20
000 - Computer science, information & general works
16
140 - Specific philosophical schools
11
320 - Political science
9
370 - Education
9
610 - Medicine & health
9
720 - Architecture
9
551 - Geology, hydrology & meteorology
7
400 - Language
5
630 - Agriculture & related technologies
5
304 - Factors affecting social behavior
4
340 - Law
4
576 - Genetics & evolution
4
580 - Plants (Botany)
4
658 - General management
4
100 - Philosophy & psychology
3
780 - Music
3
200 - Religion
2
300 - Social sciences
2
500 - Natural sciences & mathematics
2
800 - Literature & rhetoric
2
410 - Linguistics
1
530 - Physics
1
540 - Chemistry & allied sciences
1
581 - Specific topics in natural history
1
770 - Photography, photographs & computer art
1