Classification
140 - Specific philosophical schools
330 - Economics
363 - Other social problems & services
600 - Technology
333 - Economics of land & energy
27
620 - Engineering & allied operations
21
700 - The arts; fine & decorative arts
18
000 - Computer science, information & general works
15
380 - Commerce, communications & transportation
15
320 - Political science
12
900 - History & geography
10
610 - Medicine & health
9
370 - Education
8
551 - Geology, hydrology & meteorology
8
581 - Specific topics in natural history
8
658 - General management
7
630 - Agriculture & related technologies
6
576 - Genetics & evolution
5
580 - Plants (Botany)
5
340 - Law
4
720 - Architecture
4
300 - Social sciences
3
400 - Language
3
800 - Literature & rhetoric
3
361 - Social problems & social welfare in general
2
500 - Natural sciences & mathematics
2
657 - Accounting
2
160 - Logic
1
170 - Ethics
1
200 - Religion
1
297 - Islam, Babism & Bahai Faith
1
336 - Public finance
1
350 - Public administration & military science
1
410 - Linguistics
1
612 - Human physiology
1