Classification
551 - Geology, hydrology & meteorology
500 - Natural sciences & mathematics
46
363 - Other social problems & services
13
600 - Technology
11
700 - The arts; fine & decorative arts
11
620 - Engineering & allied operations
10
581 - Specific topics in natural history
7
900 - History & geography
6
000 - Computer science, information & general works
5
380 - Commerce, communications & transportation
5
140 - Specific philosophical schools
4
320 - Political science
4
540 - Chemistry & allied sciences
3
330 - Economics
2
590 - Animals (Zoology)
2
333 - Economics of land & energy
1
400 - Language
1
414 - Phonology & phonetics
1
530 - Physics
1
550 - Earth sciences
1
576 - Genetics & evolution
1
610 - Medicine & health
1
616 - Diseases
1
630 - Agriculture & related technologies
1
780 - Music
1
800 - Literature & rhetoric
1