Classification
333 - Economics of land & energy
576 - Genetics & evolution
620 - Engineering & allied operations
700 - The arts; fine & decorative arts
600 - Technology
53
900 - History & geography
50
000 - Computer science, information & general works
29
380 - Commerce, communications & transportation
24
363 - Other social problems & services
16
580 - Plants (Botany)
15
330 - Economics
13
500 - Natural sciences & mathematics
12
610 - Medicine & health
12
720 - Architecture
11
800 - Literature & rhetoric
8
140 - Specific philosophical schools
7
414 - Phonology & phonetics
7
300 - Social sciences
5
551 - Geology, hydrology & meteorology
5
340 - Law
4
540 - Chemistry & allied sciences
4
630 - Agriculture & related technologies
4
581 - Specific topics in natural history
3
612 - Human physiology
3
100 - Philosophy & psychology
2
170 - Ethics
2
370 - Education
2
658 - General management
2
297 - Islam, Babism & Bahai Faith
1
320 - Political science
1
400 - Language
1
410 - Linguistics
1
530 - Physics
1
657 - Accounting
1
770 - Photography, photographs & computer art
1