Classification
330 - Economics
600 - Technology
630 - Agriculture & related technologies
620 - Engineering & allied operations
19
333 - Economics of land & energy
17
000 - Computer science, information & general works
16
700 - The arts; fine & decorative arts
14
363 - Other social problems & services
10
551 - Geology, hydrology & meteorology
8
580 - Plants (Botany)
8
140 - Specific philosophical schools
7
658 - General management
7
380 - Commerce, communications & transportation
6
900 - History & geography
6
610 - Medicine & health
5
340 - Law
3
581 - Specific topics in natural history
3
100 - Philosophy & psychology
2
320 - Political science
2
540 - Chemistry & allied sciences
2
336 - Public finance
1
350 - Public administration & military science
1
370 - Education
1
400 - Language
1
576 - Genetics & evolution
1
612 - Human physiology
1