Classification
333 - Economics of land & energy
610 - Medicine & health
580 - Plants (Botany)
27
000 - Computer science, information & general works
25
630 - Agriculture & related technologies
24
700 - The arts; fine & decorative arts
24
363 - Other social problems & services
21
620 - Engineering & allied operations
20
600 - Technology
18
380 - Commerce, communications & transportation
13
551 - Geology, hydrology & meteorology
11
330 - Economics
10
140 - Specific philosophical schools
8
576 - Genetics & evolution
7
581 - Specific topics in natural history
6
658 - General management
6
300 - Social sciences
5
500 - Natural sciences & mathematics
5
900 - History & geography
5
540 - Chemistry & allied sciences
4
800 - Literature & rhetoric
4
340 - Law
3
414 - Phonology & phonetics
3
612 - Human physiology
3
720 - Architecture
3
100 - Philosophy & psychology
2
170 - Ethics
2
304 - Factors affecting social behavior
2
370 - Education
2
320 - Political science
1
410 - Linguistics
1
615 - Pharmacology & therapeutics
1