Classification
100 - Philosophy & psychology
200 - Religion
600 - Technology
700 - The arts; fine & decorative arts
3
900 - History & geography
300 - Social sciences
2
301 - Sociology & anthropology
2
000 - Computer science, information & general works
1
140 - Specific philosophical schools
1
320 - Political science
1
330 - Economics
1
380 - Commerce, communications & transportation
1
530 - Physics
1
620 - Engineering & allied operations
1