Classification
000 - Computer science, information & general works
1
140 - Specific philosophical schools
330 - Economics
1
333 - Economics of land & energy
1
363 - Other social problems & services
1
380 - Commerce, communications & transportation
1
551 - Geology, hydrology & meteorology
1
600 - Technology
1
610 - Medicine & health
620 - Engineering & allied operations
630 - Agriculture & related technologies
658 - General management
1