Classification
333 - Economics of land & energy
600 - Technology
620 - Engineering & allied operations
658 - General management
330 - Economics
16
700 - The arts; fine & decorative arts
15
900 - History & geography
13
363 - Other social problems & services
12
000 - Computer science, information & general works
11
580 - Plants (Botany)
8
630 - Agriculture & related technologies
8
380 - Commerce, communications & transportation
7
610 - Medicine & health
7
140 - Specific philosophical schools
4
320 - Political science
4
370 - Education
3
551 - Geology, hydrology & meteorology
2
576 - Genetics & evolution
2
720 - Architecture
2
800 - Literature & rhetoric
2
160 - Logic
1
297 - Islam, Babism & Bahai Faith
1
336 - Public finance
1
340 - Law
1
500 - Natural sciences & mathematics
1
540 - Chemistry & allied sciences
1
581 - Specific topics in natural history
1