Classification
428 - Standard English usage
6
945 - Italian Peninsula & adjacent islands
4
949 - Other parts of Europe
4
327 - International relations
3
537 - Electricity & electronics
3
616 - Diseases
3
720 - Architecture
3
809 - History, description & criticism
3
850 - Italian, Romanian & related literatures
3
025 - Library operations
2
070 - News media, journalism & publishing
2
160 - Logic
2
305 - Social groups
2
306 - Culture & institutions
2
324 - The political process
2
507 - Education, research & related topics
2
519 - Probabilities & applied mathematics
2
658 - General management
2
709 - Historical, geographic & persons treatment
2
822 - English drama
2
823 - English fiction
2
852 - Italian drama
2
001 - Knowledge
1
016 - Bibliographies of works on specific subjects
1
069 - Museum science
1
149 - Other philosophical systems
1
184 - Platonic philosophy
1
282 - Roman Catholic Church
1
301 - Sociology & anthropology
1
320 - Political science
1
338 - Production
1
343 - Military, tax, trade & industrial law
1
350 - Public administration & military science
1
364 - Criminology
1
371 - Schools & their activities; special education
1
378 - Higher education
1
384 - Communications; telecommunication
1
410 - Linguistics
1
418 - Standard usage & applied linguistics
1
420 - English & Old English
1
501 - Philosophy & theory
1
509 - Historical, geographic & persons treatment
1
520 - Astronomy & allied sciences
1
535 - Light & infrared & ultraviolet phenomena
1
551 - Geology, hydrology & meteorology
1
573 - Specific physiological systems in animals
1
574 - [Unassigned]
1
608 - Inventions & patents
1
610 - Medicine & health
1
624 - Civil engineering
1
more ...