Classification
630 - Agriculture & related technologies
320 - Political science
12
330 - Economics
11
600 - Technology
11
363 - Other social problems & services
10
620 - Engineering & allied operations
9
333 - Economics of land & energy
7
581 - Specific topics in natural history
6
000 - Computer science, information & general works
5
551 - Geology, hydrology & meteorology
5
580 - Plants (Botany)
5
700 - The arts; fine & decorative arts
5
370 - Education
4
380 - Commerce, communications & transportation
3
610 - Medicine & health
3
900 - History & geography
3
140 - Specific philosophical schools
2
301 - Sociology & anthropology
1
304 - Factors affecting social behavior
1
340 - Law
1
350 - Public administration & military science
1
361 - Social problems & social welfare in general
1
540 - Chemistry & allied sciences
1
576 - Genetics & evolution
1
612 - Human physiology
1
657 - Accounting
1
664 - Food technology
1
770 - Photography, photographs & computer art
1
800 - Literature & rhetoric
1