Classification
620 - Engineering & allied operations
551 - Geology, hydrology & meteorology
10
600 - Technology
9
363 - Other social problems & services
7
900 - History & geography
5
700 - The arts; fine & decorative arts
4
500 - Natural sciences & mathematics
3
590 - Animals (Zoology)
2
000 - Computer science, information & general works
1
140 - Specific philosophical schools
1
330 - Economics
1
380 - Commerce, communications & transportation
1
400 - Language
1
530 - Physics
1
540 - Chemistry & allied sciences
1
550 - Earth sciences
1
581 - Specific topics in natural history
1
630 - Agriculture & related technologies
1