Classification
900 - History & geography
5
320 - Political science
4
300 - Social sciences
2
576 - Genetics & evolution
2
000 - Computer science, information & general works
1
100 - Philosophy & psychology
1
700 - The arts; fine & decorative arts
1
780 - Music
1
830 - Literatures of Germanic languages
1
831 - German poetry
1
901 - Philosophy & theory
1
937 - Italy & adjacent territories to 476
1
943 - Central Europe; Germany
1
947 - Eastern Europe; Russia
1