Classification
630 - Agriculture & related technologies
330 - Economics
112
320 - Political science
108
300 - Social sciences
36
900 - History & geography
18
700 - The arts; fine & decorative arts
16
340 - Law
15
600 - Technology
11
380 - Commerce, communications & transportation
9
363 - Other social problems & services
8
620 - Engineering & allied operations
8
333 - Economics of land & energy
7
610 - Medicine & health
6
000 - Computer science, information & general works
5
140 - Specific philosophical schools
4
170 - Ethics
3
200 - Religion
3
301 - Sociology & anthropology
2
304 - Factors affecting social behavior
2
338 - Production
2
370 - Education
2
540 - Chemistry & allied sciences
2
551 - Geology, hydrology & meteorology
2
576 - Genetics & evolution
2
580 - Plants (Botany)
2
720 - Architecture
2
100 - Philosophy & psychology
1
350 - Public administration & military science
1
361 - Social problems & social welfare in general
1
500 - Natural sciences & mathematics
1
581 - Specific topics in natural history
1
800 - Literature & rhetoric
1