Classification
540 - Chemistry & allied sciences
610 - Medicine & health
700 - The arts; fine & decorative arts
900 - History & geography
600 - Technology
4
620 - Engineering & allied operations
4
333 - Economics of land & energy
3
363 - Other social problems & services
3
580 - Plants (Botany)
3
000 - Computer science, information & general works
2
330 - Economics
2
370 - Education
2
100 - Philosophy & psychology
1
140 - Specific philosophical schools
1
380 - Commerce, communications & transportation
1
500 - Natural sciences & mathematics
1
576 - Genetics & evolution
1
612 - Human physiology
1