Classification
530 - Physics
100 - Philosophy & psychology
6
160 - Logic
2
900 - History & geography
2
000 - Computer science, information & general works
1
120 - Epistemology, causation & humankind
1
170 - Ethics
1
320 - Political science
1
333 - Economics of land & energy
1
400 - Language
1
410 - Linguistics
1
500 - Natural sciences & mathematics
1
520 - Astronomy & allied sciences
1