Classification
330 - Economics
25
320 - Political science
22
900 - History & geography
17
333 - Economics of land & energy
16
370 - Education
13
700 - The arts; fine & decorative arts
9
610 - Medicine & health
8
140 - Specific philosophical schools
6
000 - Computer science, information & general works
5
301 - Sociology & anthropology
5
340 - Law
5
363 - Other social problems & services
5
336 - Public finance
4
100 - Philosophy & psychology
3
304 - Factors affecting social behavior
3
600 - Technology
3
658 - General management
3
791 - Public performances
3
949 - Other parts of Europe
3
300 - Social sciences
2
361 - Social problems & social welfare in general
2
630 - Agriculture & related technologies
2
800 - Literature & rhetoric
2
170 - Ethics
1
200 - Religion
1
327 - International relations
1
338 - Production
1
400 - Language
1
491 - East Indo-European & Celtic languages
1
547 - Organic chemistry
1
551 - Geology, hydrology & meteorology
1
553 - Economic geology
1
580 - Plants (Botany)
1
581 - Specific topics in natural history
1
620 - Engineering & allied operations
1
628 - Sanitary & municipal engineering
1
657 - Accounting
1
720 - Architecture
1
940 - History of Europe
1