Abstract: The subject of this study is the generic composition of the Tunguses (Evenks) of the Department of the Kangalas Tungus clans in the XIX - early XX century. The purpose of the study is to identify and study documentary and statistical sources in the collections of the National Archive of the Republic of Sakha (Yakutia), which contain information about the administrative-territorial structure, ancestral composition, demography and places of nomadism. General scientific methods (analysis, systematic approach) were used in the study so are special methods (historicism, historical-genetic, archival heuristics) of research. The place of the Administration in the system of administrative and territorial administration, its functions and tasks were studied by the method of analysis. The systematic approach allowed us to identify the characteristic principles of the management structure. The principle of historicism allowed us to consider the Administration in the dynamics of development, the prospect of changing historical events. The historical-genetic method requires an approach to Management as a phenomenon that naturally arose in a certain historical setting. The method of archival heuristics made it possible to identify the affairs of the Board in an array of documents from other funds. The method of archival heuristics made it possible to identify the affairs of the Board in an array of documents from other funds. As a result of the work carried out, a nomenclature of the generic composition, a list of nomadic Kangalas Tunguses on the territory of the Aldan, Amginsky, Gorny, Neryungrinsky and Khangalassky districts of the RS(Ya) was compiled. The novelty lies in the introduction into scientific circulation of previously unpublished archival documents on the declared topic. Based on the results of the work, it was concluded that further research is necessary due to the presence of a large number of unpublished documents.