Classification
500 - Natural sciences & mathematics
700 - The arts; fine & decorative arts
900 - History & geography
600 - Technology
15
620 - Engineering & allied operations
15
333 - Economics of land & energy
14
330 - Economics
4
576 - Genetics & evolution
4
000 - Computer science, information & general works
3
380 - Commerce, communications & transportation
3
580 - Plants (Botany)
3
140 - Specific philosophical schools
2
363 - Other social problems & services
2
610 - Medicine & health
2
780 - Music
2
100 - Philosophy & psychology
1
340 - Law
1
370 - Education
1
400 - Language
1
551 - Geology, hydrology & meteorology
1
658 - General management
1
800 - Literature & rhetoric
1