Classification
330 - Economics
600 - Technology
333 - Economics of land & energy
35
700 - The arts; fine & decorative arts
25
000 - Computer science, information & general works
24
620 - Engineering & allied operations
20
363 - Other social problems & services
19
380 - Commerce, communications & transportation
12
900 - History & geography
12
140 - Specific philosophical schools
9
610 - Medicine & health
8
320 - Political science
7
576 - Genetics & evolution
7
658 - General management
7
500 - Natural sciences & mathematics
6
580 - Plants (Botany)
6
370 - Education
5
551 - Geology, hydrology & meteorology
5
630 - Agriculture & related technologies
4
340 - Law
3
657 - Accounting
3
100 - Philosophy & psychology
2
200 - Religion
2
300 - Social sciences
2
304 - Factors affecting social behavior
2
530 - Physics
2
800 - Literature & rhetoric
2
336 - Public finance
1
350 - Public administration & military science
1
400 - Language
1
540 - Chemistry & allied sciences
1
581 - Specific topics in natural history
1
650 - Management & auxiliary services
1