Classification
551 - Geology, hydrology & meteorology
330 - Economics
9
363 - Other social problems & services
9
333 - Economics of land & energy
7
320 - Political science
6
000 - Computer science, information & general works
3
380 - Commerce, communications & transportation
3
600 - Technology
3
900 - History & geography
3
140 - Specific philosophical schools
2
610 - Medicine & health
2
700 - The arts; fine & decorative arts
2
100 - Philosophy & psychology
1
170 - Ethics
1
300 - Social sciences
1
500 - Natural sciences & mathematics
1
530 - Physics
1
576 - Genetics & evolution
1
580 - Plants (Botany)
1
581 - Specific topics in natural history
1
620 - Engineering & allied operations
1
630 - Agriculture & related technologies
1