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The article analyzes the UDC's class 9, based on frequent use of its classification indices, especially 929/94 divisions and their subdivisions, for publications on Biographical sciences and related studies. History and predilection of the main divisions to be used in connection with indices of other classes. An important aspect of the classification methodology within historical field is how distinctly can historical figures and historians be classified. There are also presented the existence of different types of classification, based on a combination of common auxiliary indicating place, time and direct alphabetical specifications. The existence of different types of classification is also highlighted, based on specific topics. For application there can be used common auxiliaries and/or alphabetical extension (Table Ih in UDC) and the author provides different examples of combination(s) for biographies, biographical presentation (092), various other literary forms (82-9), presentation in chronological/historical form (091), historical sources (093). The history of individual countries and peoples is expressed through the use of Table Ie - common auxiliaries of place, Table Ig - common auxiliaries of time, and, where appropriate, Table If - common auxiliaries of ethnic grouping and nationality. Class 94 allows great flexibility for collection organization which should be guided by users needs and established by the local indexing policy. If required, it is also possible to organize history by periods first and then by place - e.g. 94"1914/1918"(4) Europe during First World war or 94"04/14"(5) History of the Middle Ages in Asia. A paper addressing the classification methodology has to offer practical situations and patterns of use of the classification indices, and to present, from a broader perspective, the topics encountered in practice, bringing into question the correlation between subjects and different types of indices from several classes [ABSTRACT FROM AUTHOR]