Classification
330 - Economics
551 - Geology, hydrology & meteorology
580 - Plants (Botany)
000 - Computer science, information & general works
18
333 - Economics of land & energy
17
600 - Technology
16
363 - Other social problems & services
15
380 - Commerce, communications & transportation
12
620 - Engineering & allied operations
12
630 - Agriculture & related technologies
12
700 - The arts; fine & decorative arts
12
610 - Medicine & health
9
140 - Specific philosophical schools
7
320 - Political science
7
581 - Specific topics in natural history
6
900 - History & geography
6
340 - Law
3
658 - General management
3
720 - Architecture
3
304 - Factors affecting social behavior
2
370 - Education
2
520 - Astronomy & allied sciences
2
800 - Literature & rhetoric
2
100 - Philosophy & psychology
1
336 - Public finance
1
361 - Social problems & social welfare in general
1
500 - Natural sciences & mathematics
1
530 - Physics
1
612 - Human physiology
1
657 - Accounting
1