Classification
330 - Economics
333 - Economics of land & energy
57
700 - The arts; fine & decorative arts
45
600 - Technology
43
000 - Computer science, information & general works
34
620 - Engineering & allied operations
30
363 - Other social problems & services
24
900 - History & geography
24
380 - Commerce, communications & transportation
18
610 - Medicine & health
17
658 - General management
13
500 - Natural sciences & mathematics
10
580 - Plants (Botany)
10
551 - Geology, hydrology & meteorology
9
576 - Genetics & evolution
8
140 - Specific philosophical schools
7
320 - Political science
6
530 - Physics
6
340 - Law
5
581 - Specific topics in natural history
5
630 - Agriculture & related technologies
5
400 - Language
4
100 - Philosophy & psychology
3
370 - Education
3
720 - Architecture
3
800 - Literature & rhetoric
3
300 - Social sciences
2
304 - Factors affecting social behavior
2
332 - Financial economics
2
384 - Communications; telecommunication
2
540 - Chemistry & allied sciences
2
297 - Islam, Babism & Bahai Faith
1
302 - Social interaction
1
410 - Linguistics
1
414 - Phonology & phonetics
1
612 - Human physiology
1
670 - Manufacturing
1
683 - Hardware & household appliances
1