Classification
600 - Technology
330 - Economics
25
333 - Economics of land & energy
23
700 - The arts; fine & decorative arts
16
000 - Computer science, information & general works
15
363 - Other social problems & services
15
620 - Engineering & allied operations
14
380 - Commerce, communications & transportation
11
320 - Political science
10
370 - Education
8
610 - Medicine & health
8
630 - Agriculture & related technologies
7
140 - Specific philosophical schools
6
580 - Plants (Botany)
6
900 - History & geography
6
551 - Geology, hydrology & meteorology
5
336 - Public finance
4
304 - Factors affecting social behavior
3
576 - Genetics & evolution
3
581 - Specific topics in natural history
3
657 - Accounting
3
658 - General management
3
612 - Human physiology
2
800 - Literature & rhetoric
2
160 - Logic
1
340 - Law
1
361 - Social problems & social welfare in general
1
410 - Linguistics
1
500 - Natural sciences & mathematics
1
520 - Astronomy & allied sciences
1
530 - Physics
1
780 - Music
1