Classification
630 - Agriculture & related technologies
333 - Economics of land & energy
30
363 - Other social problems & services
29
600 - Technology
27
620 - Engineering & allied operations
26
700 - The arts; fine & decorative arts
18
330 - Economics
17
320 - Political science
16
380 - Commerce, communications & transportation
15
580 - Plants (Botany)
15
000 - Computer science, information & general works
14
551 - Geology, hydrology & meteorology
10
581 - Specific topics in natural history
9
900 - History & geography
9
610 - Medicine & health
7
340 - Law
5
140 - Specific philosophical schools
4
300 - Social sciences
3
664 - Food technology
3
720 - Architecture
3
500 - Natural sciences & mathematics
2
576 - Genetics & evolution
2
612 - Human physiology
2
658 - General management
2
100 - Philosophy & psychology
1
200 - Religion
1
301 - Sociology & anthropology
1
304 - Factors affecting social behavior
1
336 - Public finance
1
350 - Public administration & military science
1
370 - Education
1
414 - Phonology & phonetics
1
540 - Chemistry & allied sciences
1
615 - Pharmacology & therapeutics
1
800 - Literature & rhetoric
1