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#universal decimal classification
#UDC
#library science
#knowledge organization
#classification system
#bibliography
#decimal system
#libraries
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#UDC
#library classification
#knowledge structure
#decimal notation
#information retrieval
#cataloging
#organization system
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#UDC
#decimal system
#library search
#information discovery
#classification number
#knowledge finding
#catalog search
#universal decimal classification #UDC #library science #knowledge organization #classification system #bibliography #decimal system #libraries