Classification
140 - Specific philosophical schools
380 - Commerce, communications & transportation
610 - Medicine & health
700 - The arts; fine & decorative arts
333 - Economics of land & energy
24
000 - Computer science, information & general works
21
363 - Other social problems & services
21
330 - Economics
17
600 - Technology
16
620 - Engineering & allied operations
13
580 - Plants (Botany)
12
900 - History & geography
10
576 - Genetics & evolution
9
370 - Education
8
300 - Social sciences
7
304 - Factors affecting social behavior
7
340 - Law
7
540 - Chemistry & allied sciences
7
320 - Political science
6
500 - Natural sciences & mathematics
6
551 - Geology, hydrology & meteorology
6
720 - Architecture
6
800 - Literature & rhetoric
6
400 - Language
5
581 - Specific topics in natural history
5
612 - Human physiology
4
658 - General management
4
414 - Phonology & phonetics
3
630 - Agriculture & related technologies
3
170 - Ethics
2
200 - Religion
2
301 - Sociology & anthropology
2
615 - Pharmacology & therapeutics
2
100 - Philosophy & psychology
1
297 - Islam, Babism & Bahai Faith
1
361 - Social problems & social welfare in general
1
410 - Linguistics
1
550 - Earth sciences
1