Classification
320 - Political science
10
330 - Economics
7
306 - Culture & institutions
6
510 - Mathematics
5
519 - Probabilities & applied mathematics
5
004 - Data processing & computer science
4
327 - International relations
4
418 - Standard usage & applied linguistics
4
512 - Algebra
4
515 - Analysis
4
005 - Computer programming, programs & data
3
303 - Social processes
3
305 - Social groups
3
364 - Criminology
3
380 - Commerce, communications & transportation
3
516 - Geometry
3
530 - Physics
3
006 - Special computer methods
2
301 - Sociology & anthropology
2
304 - Factors affecting social behavior
2
323 - Civil & political rights
2
407 - Education, research & related topics
2
501 - Philosophy & theory
2
514 - Topology
2
532 - Fluid mechanics; liquid mechanics
2
650 - Management & auxiliary services
2
658 - General management
2
900 - History & geography
2
937 - Italy & adjacent territories to 476
2
001 - Knowledge
1
100 - Philosophy & psychology
1
150 - Psychology
1
158 - Applied psychology
1
174 - Occupational ethics
1
274 - History of Christianity in Europe
1
300 - Social sciences
1
321 - Systems of governments & states
1
325 - International migration & colonization
1
331 - Labor economics
1
332 - Financial economics
1
337 - International economics
1
339 - Macroeconomics & related topics
1
344 - Labor, social, education & cultural law
1
353 - Specific fields of public administration
1
365 - Penal & related institutions
1
370 - Education
1
371 - Schools & their activities; special education
1
374 - Adult education
1
378 - Higher education
1
511 - General principles of mathematics
1
more ...