Classification
320 - Political science
500 - Natural sciences & mathematics
340 - Law
5
576 - Genetics & evolution
5
700 - The arts; fine & decorative arts
5
900 - History & geography
5
140 - Specific philosophical schools
4
363 - Other social problems & services
4
380 - Commerce, communications & transportation
4
720 - Architecture
4
000 - Computer science, information & general works
3
300 - Social sciences
3
333 - Economics of land & energy
3
600 - Technology
3
620 - Engineering & allied operations
3
330 - Economics
2
100 - Philosophy & psychology
1
360 - Social problems & services; associations
1
361 - Social problems & social welfare in general
1
370 - Education
1
530 - Physics
1
540 - Chemistry & allied sciences
1
580 - Plants (Botany)
1