Classification
330 - Economics
380 - Commerce, communications & transportation
600 - Technology
658 - General management
333 - Economics of land & energy
11
363 - Other social problems & services
9
700 - The arts; fine & decorative arts
9
000 - Computer science, information & general works
8
610 - Medicine & health
8
320 - Political science
7
620 - Engineering & allied operations
7
140 - Specific philosophical schools
6
900 - History & geography
6
370 - Education
4
576 - Genetics & evolution
4
551 - Geology, hydrology & meteorology
3
580 - Plants (Botany)
3
800 - Literature & rhetoric
3
630 - Agriculture & related technologies
2
720 - Architecture
2
100 - Philosophy & psychology
1
300 - Social sciences
1
336 - Public finance
1
340 - Law
1
361 - Social problems & social welfare in general
1
384 - Communications; telecommunication
1
400 - Language
1
410 - Linguistics
1
500 - Natural sciences & mathematics
1
540 - Chemistry & allied sciences
1
581 - Specific topics in natural history
1
615 - Pharmacology & therapeutics
1
651 - Office services
1
780 - Music
1