Classification
330 - Economics
380 - Commerce, communications & transportation
000 - Computer science, information & general works
3
333 - Economics of land & energy
2
363 - Other social problems & services
2
500 - Natural sciences & mathematics
2
600 - Technology
2
700 - The arts; fine & decorative arts
2
900 - History & geography
2
304 - Factors affecting social behavior
1
370 - Education
1
580 - Plants (Botany)
1
620 - Engineering & allied operations
1