Classification
330 - Economics
720 - Architecture
900 - History & geography
600 - Technology
29
700 - The arts; fine & decorative arts
29
620 - Engineering & allied operations
27
000 - Computer science, information & general works
19
333 - Economics of land & energy
19
363 - Other social problems & services
16
380 - Commerce, communications & transportation
15
610 - Medicine & health
10
140 - Specific philosophical schools
9
320 - Political science
9
370 - Education
8
300 - Social sciences
7
576 - Genetics & evolution
7
100 - Philosophy & psychology
5
551 - Geology, hydrology & meteorology
5
800 - Literature & rhetoric
5
580 - Plants (Botany)
4
658 - General management
4
200 - Religion
3
530 - Physics
3
770 - Photography, photographs & computer art
3
780 - Music
3
170 - Ethics
2
297 - Islam, Babism & Bahai Faith
2
301 - Sociology & anthropology
1
304 - Factors affecting social behavior
1
340 - Law
1
400 - Language
1
410 - Linguistics
1
500 - Natural sciences & mathematics
1
540 - Chemistry & allied sciences
1
550 - Earth sciences
1
630 - Agriculture & related technologies
1
657 - Accounting
1