Classification
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400 - Language
2
519 - Probabilities & applied mathematics
2
530 - Physics
2
658 - General management
2
947 - Eastern Europe; Russia
2
003 - Systems
1
004 - Data processing & computer science
1
006 - Special computer methods
1
107 - Education, research & related topics
1
126 - The self
1
172 - Political ethics
1
174 - Occupational ethics
1
335 - Socialism & related systems
1
355 - Military science
1
360 - Social problems & services; associations
1
401 - Philosophy & theory
1
410 - Linguistics
1
520 - Astronomy & allied sciences
1
577 - Ecology
1
581 - Specific topics in natural history
1
601 - Philosophy & theory
1
620 - Engineering & allied operations
1
621 - Applied physics
1
720 - Architecture
1
791 - Public performances
1
792 - Stage presentations
1
808 - Rhetoric & collections of literature
1
809 - History, description & criticism
1
909 - World history
1
945 - Italian Peninsula & adjacent islands
1
950 - History of Asia; Far East
1
959 - Southeast Asia
1