Classification
330 - Economics
580 - Plants (Botany)
600 - Technology
29
333 - Economics of land & energy
28
363 - Other social problems & services
17
620 - Engineering & allied operations
16
900 - History & geography
13
000 - Computer science, information & general works
11
700 - The arts; fine & decorative arts
11
380 - Commerce, communications & transportation
8
551 - Geology, hydrology & meteorology
7
320 - Political science
5
610 - Medicine & health
5
658 - General management
5
540 - Chemistry & allied sciences
4
630 - Agriculture & related technologies
4
140 - Specific philosophical schools
3
340 - Law
3
361 - Social problems & social welfare in general
2
500 - Natural sciences & mathematics
2
581 - Specific topics in natural history
2
100 - Philosophy & psychology
1
336 - Public finance
1
370 - Education
1
530 - Physics
1
576 - Genetics & evolution
1
615 - Pharmacology & therapeutics
1
720 - Architecture
1
800 - Literature & rhetoric
1