Classification
576 - Genetics & evolution
620 - Engineering & allied operations
700 - The arts; fine & decorative arts
900 - History & geography
600 - Technology
85
333 - Economics of land & energy
50
000 - Computer science, information & general works
23
380 - Commerce, communications & transportation
23
363 - Other social problems & services
20
330 - Economics
17
500 - Natural sciences & mathematics
15
720 - Architecture
15
580 - Plants (Botany)
13
340 - Law
10
610 - Medicine & health
9
140 - Specific philosophical schools
8
414 - Phonology & phonetics
7
800 - Literature & rhetoric
7
658 - General management
5
320 - Political science
4
300 - Social sciences
3
370 - Education
3
530 - Physics
3
551 - Geology, hydrology & meteorology
3
630 - Agriculture & related technologies
3
770 - Photography, photographs & computer art
3
170 - Ethics
2
540 - Chemistry & allied sciences
2
100 - Philosophy & psychology
1
297 - Islam, Babism & Bahai Faith
1
304 - Factors affecting social behavior
1
400 - Language
1
410 - Linguistics
1
581 - Specific topics in natural history
1