Classification
320 - Political science
576 - Genetics & evolution
700 - The arts; fine & decorative arts
900 - History & geography
330 - Economics
19
340 - Law
5
600 - Technology
5
140 - Specific philosophical schools
4
363 - Other social problems & services
4
380 - Commerce, communications & transportation
4
620 - Engineering & allied operations
4
500 - Natural sciences & mathematics
3
720 - Architecture
3
800 - Literature & rhetoric
3
200 - Religion
2
300 - Social sciences
2
551 - Geology, hydrology & meteorology
2
791 - Public performances
2
000 - Computer science, information & general works
1
100 - Philosophy & psychology
1
170 - Ethics
1
304 - Factors affecting social behavior
1
333 - Economics of land & energy
1
370 - Education
1
581 - Specific topics in natural history
1
630 - Agriculture & related technologies
1
943 - Central Europe; Germany
1