Classification
551 - Geology, hydrology & meteorology
620 - Engineering & allied operations
630 - Agriculture & related technologies
600 - Technology
37
000 - Computer science, information & general works
22
333 - Economics of land & energy
21
363 - Other social problems & services
21
580 - Plants (Botany)
16
330 - Economics
14
700 - The arts; fine & decorative arts
11
610 - Medicine & health
9
900 - History & geography
8
581 - Specific topics in natural history
6
380 - Commerce, communications & transportation
5
320 - Political science
4
500 - Natural sciences & mathematics
3
720 - Architecture
3
140 - Specific philosophical schools
2
340 - Law
2
658 - General management
2
100 - Philosophy & psychology
1
304 - Factors affecting social behavior
1
361 - Social problems & social welfare in general
1
410 - Linguistics
1
414 - Phonology & phonetics
1
540 - Chemistry & allied sciences
1
576 - Genetics & evolution
1
612 - Human physiology
1