Classification
576 - Genetics & evolution
333 - Economics of land & energy
24
000 - Computer science, information & general works
22
700 - The arts; fine & decorative arts
22
600 - Technology
18
363 - Other social problems & services
16
900 - History & geography
16
620 - Engineering & allied operations
15
330 - Economics
10
551 - Geology, hydrology & meteorology
8
140 - Specific philosophical schools
6
320 - Political science
6
610 - Medicine & health
6
380 - Commerce, communications & transportation
5
414 - Phonology & phonetics
5
370 - Education
4
400 - Language
4
580 - Plants (Botany)
3
658 - General management
3
340 - Law
2
410 - Linguistics
2
500 - Natural sciences & mathematics
2
530 - Physics
2
581 - Specific topics in natural history
2
630 - Agriculture & related technologies
2
720 - Architecture
2
100 - Philosophy & psychology
1
297 - Islam, Babism & Bahai Faith
1
304 - Factors affecting social behavior
1
361 - Social problems & social welfare in general
1
800 - Literature & rhetoric
1