Classification
551 - Geology, hydrology & meteorology
600 - Technology
630 - Agriculture & related technologies
620 - Engineering & allied operations
15
000 - Computer science, information & general works
11
333 - Economics of land & energy
11
330 - Economics
9
580 - Plants (Botany)
7
363 - Other social problems & services
6
700 - The arts; fine & decorative arts
6
610 - Medicine & health
5
380 - Commerce, communications & transportation
3
900 - History & geography
3
320 - Political science
2
340 - Law
2
581 - Specific topics in natural history
2
658 - General management
2
720 - Architecture
2
100 - Philosophy & psychology
1
140 - Specific philosophical schools
1
410 - Linguistics
1
500 - Natural sciences & mathematics
1
612 - Human physiology
1