Classification
630 - Agriculture & related technologies
330 - Economics
89
320 - Political science
84
600 - Technology
73
363 - Other social problems & services
71
620 - Engineering & allied operations
55
333 - Economics of land & energy
45
300 - Social sciences
31
610 - Medicine & health
25
380 - Commerce, communications & transportation
21
700 - The arts; fine & decorative arts
21
000 - Computer science, information & general works
18
581 - Specific topics in natural history
18
900 - History & geography
18
340 - Law
16
551 - Geology, hydrology & meteorology
15
580 - Plants (Botany)
14
304 - Factors affecting social behavior
12
140 - Specific philosophical schools
10
370 - Education
5
170 - Ethics
4
576 - Genetics & evolution
4
800 - Literature & rhetoric
4
100 - Philosophy & psychology
3
200 - Religion
3
500 - Natural sciences & mathematics
2
590 - Animals (Zoology)
2
658 - General management
2
664 - Food technology
2
301 - Sociology & anthropology
1
336 - Public finance
1
540 - Chemistry & allied sciences
1
612 - Human physiology
1
720 - Architecture
1
770 - Photography, photographs & computer art
1