Classification
551 - Geology, hydrology & meteorology
000 - Computer science, information & general works
21
700 - The arts; fine & decorative arts
16
580 - Plants (Botany)
14
333 - Economics of land & energy
10
363 - Other social problems & services
10
581 - Specific topics in natural history
8
330 - Economics
6
500 - Natural sciences & mathematics
5
600 - Technology
5
620 - Engineering & allied operations
5
630 - Agriculture & related technologies
5
800 - Literature & rhetoric
5
900 - History & geography
5
140 - Specific philosophical schools
4
320 - Political science
4
576 - Genetics & evolution
4
610 - Medicine & health
4
380 - Commerce, communications & transportation
3
530 - Physics
3
370 - Education
2
340 - Law
1
400 - Language
1
550 - Earth sciences
1
612 - Human physiology
1
658 - General management
1
720 - Architecture
1