Classification
001 - Knowledge
1
011 - Bibliographies
1
158 - Applied psychology
3
170 - Ethics
1
302 - Social interaction
3
330 - Economics
2
331 - Labor economics
10
338 - Production
3
381 - Commerce
1
384 - Communications; telecommunication
3
500 - Natural sciences & mathematics
10
510 - Mathematics
3
519 - Probabilities & applied mathematics
5
616 - Diseases
620 - Engineering & allied operations
5
650 - Management & auxiliary services
1
658 - General management
3
745 - Decorative arts
1
770 - Photography, photographs & computer art
1
800 - Literature & rhetoric
1