Classification
140 - Specific philosophical schools
620 - Engineering & allied operations
600 - Technology
27
900 - History & geography
23
333 - Economics of land & energy
16
700 - The arts; fine & decorative arts
15
363 - Other social problems & services
14
380 - Commerce, communications & transportation
13
330 - Economics
10
000 - Computer science, information & general works
7
320 - Political science
7
610 - Medicine & health
7
580 - Plants (Botany)
6
340 - Law
5
500 - Natural sciences & mathematics
5
576 - Genetics & evolution
5
720 - Architecture
5
581 - Specific topics in natural history
4
400 - Language
2
630 - Agriculture & related technologies
2
800 - Literature & rhetoric
2
170 - Ethics
1
200 - Religion
1
297 - Islam, Babism & Bahai Faith
1
304 - Factors affecting social behavior
1
361 - Social problems & social welfare in general
1
370 - Education
1
410 - Linguistics
1
414 - Phonology & phonetics
1
530 - Physics
1
540 - Chemistry & allied sciences
1
658 - General management
1