Classification
540 - Chemistry & allied sciences
600 - Technology
620 - Engineering & allied operations
185
700 - The arts; fine & decorative arts
108
363 - Other social problems & services
83
333 - Economics of land & energy
82
900 - History & geography
51
000 - Computer science, information & general works
50
610 - Medicine & health
42
330 - Economics
34
580 - Plants (Botany)
26
630 - Agriculture & related technologies
25
500 - Natural sciences & mathematics
24
380 - Commerce, communications & transportation
19
576 - Genetics & evolution
17
140 - Specific philosophical schools
13
581 - Specific topics in natural history
11
414 - Phonology & phonetics
10
530 - Physics
9
320 - Political science
8
370 - Education
8
551 - Geology, hydrology & meteorology
7
612 - Human physiology
7
300 - Social sciences
6
304 - Factors affecting social behavior
5
615 - Pharmacology & therapeutics
5
340 - Law
4
400 - Language
4
720 - Architecture
4
100 - Philosophy & psychology
3
658 - General management
3
800 - Literature & rhetoric
3
301 - Sociology & anthropology
2
657 - Accounting
2
170 - Ethics
1