Classification
333 - Economics of land & energy
380 - Commerce, communications & transportation
720 - Architecture
700 - The arts; fine & decorative arts
28
600 - Technology
25
900 - History & geography
20
000 - Computer science, information & general works
17
363 - Other social problems & services
17
620 - Engineering & allied operations
17
330 - Economics
15
610 - Medicine & health
15
551 - Geology, hydrology & meteorology
11
320 - Political science
10
576 - Genetics & evolution
7
800 - Literature & rhetoric
7
140 - Specific philosophical schools
6
580 - Plants (Botany)
6
370 - Education
5
340 - Law
4
658 - General management
4
300 - Social sciences
3
500 - Natural sciences & mathematics
3
630 - Agriculture & related technologies
3
170 - Ethics
2
657 - Accounting
2
100 - Philosophy & psychology
1
120 - Epistemology, causation & humankind
1
400 - Language
1
612 - Human physiology
1