Classification
140 - Specific philosophical schools
330 - Economics
2
333 - Economics of land & energy
363 - Other social problems & services
610 - Medicine & health
630 - Agriculture & related technologies
2
658 - General management
700 - The arts; fine & decorative arts
000 - Computer science, information & general works
1
370 - Education
1
380 - Commerce, communications & transportation
1
551 - Geology, hydrology & meteorology
1
580 - Plants (Botany)
1
600 - Technology
1
620 - Engineering & allied operations
1