Classification
330 - Economics
39
320 - Political science
16
900 - History & geography
15
370 - Education
14
610 - Medicine & health
11
304 - Factors affecting social behavior
9
340 - Law
5
336 - Public finance
4
700 - The arts; fine & decorative arts
4
301 - Sociology & anthropology
3
333 - Economics of land & energy
3
363 - Other social problems & services
3
580 - Plants (Botany)
3
600 - Technology
3
300 - Social sciences
2
949 - Other parts of Europe
2
000 - Computer science, information & general works
1
004 - Data processing & computer science
1
100 - Philosophy & psychology
1
200 - Religion
1
297 - Islam, Babism & Bahai Faith
1
305 - Social groups
1
323 - Civil & political rights
1
338 - Production
1
361 - Social problems & social welfare in general
1
362 - Social welfare problems & services
1
380 - Commerce, communications & transportation
1
400 - Language
1
410 - Linguistics
1
581 - Specific topics in natural history
1
620 - Engineering & allied operations
1
630 - Agriculture & related technologies
1
800 - Literature & rhetoric
1
940 - History of Europe
1