Classification
551 - Geology, hydrology & meteorology
333 - Economics of land & energy
25
363 - Other social problems & services
23
600 - Technology
23
700 - The arts; fine & decorative arts
23
620 - Engineering & allied operations
18
900 - History & geography
17
000 - Computer science, information & general works
16
330 - Economics
16
380 - Commerce, communications & transportation
15
610 - Medicine & health
10
580 - Plants (Botany)
9
720 - Architecture
8
140 - Specific philosophical schools
6
320 - Political science
5
370 - Education
4
500 - Natural sciences & mathematics
4
576 - Genetics & evolution
4
630 - Agriculture & related technologies
4
530 - Physics
3
581 - Specific topics in natural history
3
800 - Literature & rhetoric
3
540 - Chemistry & allied sciences
2
550 - Earth sciences
2
658 - General management
2
100 - Philosophy & psychology
1
170 - Ethics
1
300 - Social sciences
1
304 - Factors affecting social behavior
1
340 - Law
1
400 - Language
1