Classification
320 - Political science
1,528
330 - Economics
1,479
780 - Music
963
900 - History & geography
721
300 - Social sciences
446
800 - Literature & rhetoric
300
340 - Law
245
700 - The arts; fine & decorative arts
217
850 - Italian, Romanian & related literatures
207
370 - Education
188
100 - Philosophy & psychology
163
410 - Linguistics
154
630 - Agriculture & related technologies
143
616 - Diseases
135
720 - Architecture
104
610 - Medicine & health
99
600 - Technology
80
140 - Specific philosophical schools
74
820 - English & Old English literatures
74
945 - Italian Peninsula & adjacent islands
68
500 - Natural sciences & mathematics
63
000 - Computer science, information & general works
61
333 - Economics of land & energy
60
851 - Italian poetry
60
380 - Commerce, communications & transportation
58
620 - Engineering & allied operations
56
530 - Physics
55
301 - Sociology & anthropology
47
363 - Other social problems & services
47
853 - Italian fiction
42
400 - Language
41
519 - Probabilities & applied mathematics
38
170 - Ethics
36
520 - Astronomy & allied sciences
35
515 - Analysis
34
658 - General management
33
200 - Religion
32
510 - Mathematics
32
304 - Factors affecting social behavior
27
338 - Production
25
195 - Philosophy of Italy
24
306 - Culture & institutions
23
809 - History, description & criticism
22
551 - Geology, hydrology & meteorology
21
940 - History of Europe
21
371 - Schools & their activities; special education
20
016 - Bibliographies of works on specific subjects
19
305 - Social groups
18
540 - Chemistry & allied sciences
18
617 - Surgery & related medical specialties
18
more ...