Classification
330 - Economics
91
333 - Economics of land & energy
18
630 - Agriculture & related technologies
17
600 - Technology
13
000 - Computer science, information & general works
12
580 - Plants (Botany)
11
620 - Engineering & allied operations
10
700 - The arts; fine & decorative arts
9
658 - General management
8
363 - Other social problems & services
7
320 - Political science
6
551 - Geology, hydrology & meteorology
6
140 - Specific philosophical schools
4
338 - Production
4
380 - Commerce, communications & transportation
4
576 - Genetics & evolution
4
610 - Medicine & health
4
361 - Social problems & social welfare in general
3
300 - Social sciences
2
340 - Law
2
370 - Education
2
530 - Physics
2
900 - History & geography
2
331 - Labor economics
1
336 - Public finance
1
500 - Natural sciences & mathematics
1
581 - Specific topics in natural history
1
612 - Human physiology
1
720 - Architecture
1