Geographical entities are named differently in different knowledge organization systems, depending on the system and the way entities are arranged and named. In this thesis, we analysed geographical entities in three bibliographic classification systems: Universal decimal classification (UDC), Dewey decimal classification (DDC) and Library of Congress classification (LCC). We especially focused on UDC and on common auxiliaries of place for Slovenian rivers, within the Danube's basin. Common auxiliares of place for Sava and Drava were cancelled in the 1997 revision. We also had to figure out the arrangement system, that is used to classify both European and world's rivers basins, so we could use a similar system to introduce our new auxiliaries. The new ones are based on the old auxiliaries for Sava and Drava. There are 20 new ones. We also checked how the library material is described in the National and university library's catalog. For this purpose we searched for UDC common auxiliaries of place starting with (282) and subject headings. There are only 274 out of 1.460.000 entries in the whole catalog. However, it is difficult to find the right library material due to indexing inconsistency. Further consideration was given to the river names in the proposed auxiliaries. Based on our research, catalogers and users would benefit if more detailed UDC numbers for individual rivers would be available. Towards this end, we have proposed a more detailed subdivision of rivers in the UDC place table.
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