Classification
140 - Specific philosophical schools
330 - Economics
700 - The arts; fine & decorative arts
18
333 - Economics of land & energy
16
363 - Other social problems & services
15
610 - Medicine & health
14
320 - Political science
12
380 - Commerce, communications & transportation
10
000 - Computer science, information & general works
9
551 - Geology, hydrology & meteorology
9
600 - Technology
9
370 - Education
8
620 - Engineering & allied operations
5
900 - History & geography
5
300 - Social sciences
4
304 - Factors affecting social behavior
4
200 - Religion
3
297 - Islam, Babism & Bahai Faith
3
361 - Social problems & social welfare in general
3
576 - Genetics & evolution
3
581 - Specific topics in natural history
3
800 - Literature & rhetoric
3
100 - Philosophy & psychology
2
170 - Ethics
2
301 - Sociology & anthropology
2
340 - Law
2
400 - Language
2
500 - Natural sciences & mathematics
2
540 - Chemistry & allied sciences
2
630 - Agriculture & related technologies
2
720 - Architecture
2
160 - Logic
1
410 - Linguistics
1
414 - Phonology & phonetics
1
580 - Plants (Botany)
1
615 - Pharmacology & therapeutics
1
658 - General management
1