Classification
781 - General principles & musical forms
620 - Engineering & allied operations
68
621 - Applied physics
49
384 - Communications; telecommunication
7
331 - Labor economics
5
745 - Decorative arts
5
500 - Natural sciences & mathematics
4
000 - Computer science, information & general works
3
006 - Special computer methods
3
302 - Social interaction
1
374 - Adult education
1
510 - Mathematics
1
534 - Sound & related vibrations
1
650 - Management & auxiliary services
1
658 - General management
1
778 - Fields & kinds of photography
1
791 - Public performances
1
794 - Indoor games of skill
1
800 - Literature & rhetoric
1