Classification
630 - Agriculture & related technologies
52
600 - Technology
27
620 - Engineering & allied operations
27
330 - Economics
21
700 - The arts; fine & decorative arts
19
333 - Economics of land & energy
18
363 - Other social problems & services
18
580 - Plants (Botany)
18
610 - Medicine & health
14
414 - Phonology & phonetics
8
551 - Geology, hydrology & meteorology
8
320 - Political science
7
581 - Specific topics in natural history
6
300 - Social sciences
5
340 - Law
5
900 - History & geography
5
500 - Natural sciences & mathematics
4
140 - Specific philosophical schools
3
400 - Language
3
100 - Philosophy & psychology
2
170 - Ethics
2
000 - Computer science, information & general works
1
304 - Factors affecting social behavior
1
338 - Production
1
361 - Social problems & social welfare in general
1
370 - Education
1
540 - Chemistry & allied sciences
1
576 - Genetics & evolution
1
612 - Human physiology
1
658 - General management
1
720 - Architecture
1