Classification
530 - Physics
333 - Economics of land & energy
7
000 - Computer science, information & general works
5
700 - The arts; fine & decorative arts
5
140 - Specific philosophical schools
2
380 - Commerce, communications & transportation
2
540 - Chemistry & allied sciences
2
610 - Medicine & health
2
620 - Engineering & allied operations
2
304 - Factors affecting social behavior
1
330 - Economics
1
363 - Other social problems & services
1
580 - Plants (Botany)
1
600 - Technology
1
658 - General management
1
900 - History & geography
1