Classification
900 - History & geography
330 - Economics
242
320 - Political science
96
300 - Social sciences
86
333 - Economics of land & energy
26
100 - Philosophy & psychology
25
363 - Other social problems & services
11
380 - Commerce, communications & transportation
11
140 - Specific philosophical schools
9
700 - The arts; fine & decorative arts
9
600 - Technology
7
340 - Law
6
610 - Medicine & health
6
630 - Agriculture & related technologies
6
336 - Public finance
5
800 - Literature & rhetoric
5
301 - Sociology & anthropology
4
170 - Ethics
3
200 - Religion
3
350 - Public administration & military science
3
576 - Genetics & evolution
3
581 - Specific topics in natural history
3
657 - Accounting
3
000 - Computer science, information & general works
2
304 - Factors affecting social behavior
2
370 - Education
2
410 - Linguistics
2
500 - Natural sciences & mathematics
2
551 - Geology, hydrology & meteorology
2
297 - Islam, Babism & Bahai Faith
1
321 - Systems of governments & states
1
361 - Social problems & social welfare in general
1
400 - Language
1
530 - Physics
1
580 - Plants (Botany)
1
620 - Engineering & allied operations
1
658 - General management
1
770 - Photography, photographs & computer art
1
791 - Public performances
1
949 - Other parts of Europe
1