Classification
800 - Literature & rhetoric
330 - Economics
56
658 - General management
35
338 - Production
33
158 - Applied psychology
30
650 - Management & auxiliary services
28
332 - Financial economics
15
500 - Natural sciences & mathematics
11
170 - Ethics
8
381 - Commerce
8
001 - Knowledge
7
300 - Social sciences
5
384 - Communications; telecommunication
5
620 - Engineering & allied operations
5
796 - Athletic & outdoor sports & games
5
000 - Computer science, information & general works
4
303 - Social processes
4
791 - Public performances
4
005 - Computer programming, programs & data
3
302 - Social interaction
3
331 - Labor economics
3
510 - Mathematics
3
174 - Occupational ethics
2
355 - Military science
2
621 - Applied physics
2
629 - Other branches of engineering
2
647 - Management of public households
2
670 - Manufacturing
2
745 - Decorative arts
2
003 - Systems
1
004 - Data processing & computer science
1
011 - Bibliographies
1
070 - News media, journalism & publishing
1
150 - Psychology
1
153 - Mental processes & intelligence
1
196 - Philosophy of Spain & Portugal
1
305 - Social groups
1
327 - International relations
1
333 - Economics of land & energy
1
363 - Other social problems & services
1
364 - Criminology
1
509 - Historical, geographic & persons treatment
1
519 - Probabilities & applied mathematics
1
540 - Chemistry & allied sciences
1
577 - Ecology
1
616 - Diseases
1
659 - Advertising & public relations
1
700 - The arts; fine & decorative arts
1
709 - Historical, geographic & persons treatment
1
720 - Architecture
1
more ...