1. about the subject

Classification of historical sources. The diversity of historical sources requires their classification. There is no consensus on this issue.
Historical sources are divided into six groups. The main groups of historical sources and comments on their composition are given in the table below (see Table 3.1).
The distribution of historical sources may in some cases be conditional, as there are sources that can be applied to both material, ethnographic and written sources. In the process of scientific research, a wide range of resources are used, therefore the sciences that study these resources interact with each other and with the research fields that contribute to this work.

The collection and preservation of historical sources has always been of state importance. Archives, museums, and reserves were created for this purpose, and special care was taken towards ensuring that the historical monuments are passed down from generation to generation.

Table 3.1
Main groups of historical sources and their composition

С. №	Groups of historical sources	Composition
1.	Oral sources	Legends, tales, bayatis, proverbs, sayings, etc
2.	Material sources	Stone tools, handicraft wares, art Works, architectural monuments, remnants of houses, etc
3.	Linguistic	Various information about languages
4.	Ethnographic	Household traditions of different nations.
5.	Written	Epigraphic monuments, Handwritings on graphite, papyrus, leather, Printing materials, etc
6.	Cinema-Photo-Phono documents (sometimes, photo cinema and phono documents appear in separate groups)	Photo documents, movie chronicles, audio recordings, etc

The source: Source study of the history of the USSR, p.4; Tikhomirov M.N.
Source study of the history of the USSR, p. 7