Classification
630 - Agriculture & related technologies
600 - Technology
26
363 - Other social problems & services
23
620 - Engineering & allied operations
23
330 - Economics
13
333 - Economics of land & energy
13
700 - The arts; fine & decorative arts
12
320 - Political science
8
380 - Commerce, communications & transportation
8
300 - Social sciences
7
000 - Computer science, information & general works
6
551 - Geology, hydrology & meteorology
6
581 - Specific topics in natural history
5
900 - History & geography
5
540 - Chemistry & allied sciences
4
500 - Natural sciences & mathematics
3
580 - Plants (Botany)
3
610 - Medicine & health
3
100 - Philosophy & psychology
2
140 - Specific philosophical schools
2
170 - Ethics
2
301 - Sociology & anthropology
2
340 - Law
2
530 - Physics
2
590 - Animals (Zoology)
2
720 - Architecture
2
304 - Factors affecting social behavior
1
361 - Social problems & social welfare in general
1
370 - Education
1
550 - Earth sciences
1
576 - Genetics & evolution
1
658 - General management
1