Classification
658 - General management
330 - Economics
50
338 - Production
23
300 - Social sciences
21
302 - Social interaction
18
500 - Natural sciences & mathematics
13
331 - Labor economics
12
650 - Management & auxiliary services
11
381 - Commerce
9
670 - Manufacturing
9
000 - Computer science, information & general works
8
363 - Other social problems & services
8
700 - The arts; fine & decorative arts
7
158 - Applied psychology
6
384 - Communications; telecommunication
6
551 - Geology, hydrology & meteorology
6
333 - Economics of land & energy
5
620 - Engineering & allied operations
5
610 - Medicine & health
4
745 - Decorative arts
4
001 - Knowledge
3
005 - Computer programming, programs & data
3
140 - Specific philosophical schools
3
152 - Perception, movement, emotions & drives
3
170 - Ethics
3
304 - Factors affecting social behavior
3
332 - Financial economics
3
380 - Commerce, communications & transportation
3
600 - Technology
3
630 - Agriculture & related technologies
3
153 - Mental processes & intelligence
2
580 - Plants (Botany)
2
581 - Specific topics in natural history
2
004 - Data processing & computer science
1
006 - Special computer methods
1
011 - Bibliographies
1
065 - Organizations in Italy & adjacent islands
1
297 - Islam, Babism & Bahai Faith
1
303 - Social processes
1
320 - Political science
1
361 - Social problems & social welfare in general
1
364 - Criminology
1
368 - Insurance
1
370 - Education
1
372 - Elementary education
1
400 - Language
1
414 - Phonology & phonetics
1
519 - Probabilities & applied mathematics
1
559 - Earth sciences of other areas
1
576 - Genetics & evolution
1
more ...