Classification
576 - Genetics & evolution
700 - The arts; fine & decorative arts
20
000 - Computer science, information & general works
19
333 - Economics of land & energy
19
620 - Engineering & allied operations
18
600 - Technology
16
900 - History & geography
11
330 - Economics
10
580 - Plants (Botany)
10
380 - Commerce, communications & transportation
9
500 - Natural sciences & mathematics
8
610 - Medicine & health
8
140 - Specific philosophical schools
7
363 - Other social problems & services
7
540 - Chemistry & allied sciences
7
100 - Philosophy & psychology
6
300 - Social sciences
5
370 - Education
5
551 - Geology, hydrology & meteorology
4
581 - Specific topics in natural history
4
612 - Human physiology
4
720 - Architecture
4
400 - Language
3
414 - Phonology & phonetics
3
530 - Physics
3
570 - Life sciences; biology
3
616 - Diseases
3
301 - Sociology & anthropology
2
658 - General management
2
170 - Ethics
1
297 - Islam, Babism & Bahai Faith
1
361 - Social problems & social welfare in general
1
410 - Linguistics
1
630 - Agriculture & related technologies
1
780 - Music
1
800 - Literature & rhetoric
1
920 - Biography, genealogy & insignia
1