Classification
658 - General management
330 - Economics
3
331 - Labor economics
2
500 - Natural sciences & mathematics
2
000 - Computer science, information & general works
1
005 - Computer programming, programs & data
1
153 - Mental processes & intelligence
1
338 - Production
1
353 - Specific fields of public administration
1
363 - Other social problems & services
1
364 - Criminology
1
384 - Communications; telecommunication
1
600 - Technology
1
620 - Engineering & allied operations
1
670 - Manufacturing
1