Classification
001 - Knowledge
1
300 - Social sciences
1
305 - Social groups
1
330 - Economics
3
331 - Labor economics
1
363 - Other social problems & services
1
364 - Criminology
1
500 - Natural sciences & mathematics
1
509 - Historical, geographic & persons treatment
1
530 - Physics
1
615 - Pharmacology & therapeutics
1
616 - Diseases
1
700 - The arts; fine & decorative arts
1
780 - Music
1
809 - History, description & criticism
1