Classification
370 - Education
330 - Economics
30
320 - Political science
27
333 - Economics of land & energy
25
700 - The arts; fine & decorative arts
22
100 - Philosophy & psychology
20
610 - Medicine & health
20
363 - Other social problems & services
19
600 - Technology
19
140 - Specific philosophical schools
18
300 - Social sciences
17
900 - History & geography
16
000 - Computer science, information & general works
12
380 - Commerce, communications & transportation
9
340 - Law
6
620 - Engineering & allied operations
6
630 - Agriculture & related technologies
6
658 - General management
6
400 - Language
5
170 - Ethics
4
200 - Religion
4
304 - Factors affecting social behavior
4
580 - Plants (Botany)
4
371 - Schools & their activities; special education
3
551 - Geology, hydrology & meteorology
3
576 - Genetics & evolution
3
350 - Public administration & military science
2
500 - Natural sciences & mathematics
2
780 - Music
2
153 - Mental processes & intelligence
1
160 - Logic
1
301 - Sociology & anthropology
1
336 - Public finance
1
360 - Social problems & services; associations
1
361 - Social problems & social welfare in general
1
364 - Criminology
1
384 - Communications; telecommunication
1
581 - Specific topics in natural history
1
616 - Diseases
1
657 - Accounting
1
720 - Architecture
1
791 - Public performances
1
800 - Literature & rhetoric
1