Marie Balíková Czech National Library 8 examples Heading water UDC 546.212 (inorganic chemistry) UDC 556-032.2 (hydrology) UDC 628.1.03 (water management) Heading incest UDC 316.835.2 (sociology) UDC 343.542.5 (criminal law) UDC 616.89-008.442.38 (psychiatry) MSAC