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Reference (related topics not included in this class).
But all these nuances are more necessary for those who are directly involved in systematization of information. Young scientists, who limit themselves to selecting UDC for their own woo navigate in sections and correctly identify the signs of connection and determinants.

Sections according to GOST
Although classification tables with their own buy albania telemarketing data sets of blocks can be found on various Internet resources, according to GOST 7.90-2007, there are only 10 sections in the UDC:

General Department. Science and knowledge. Information. Documentation. Librarianship. Organization. Publications in general.
Philosophy. Psychology.
Religion. Theology.
Social science.
Reserve section, empty since 1962.
Mathematics. Natural sciences.
Applied sciences. Medicine. Technology.
Art. Photography. Music. Games. Sports.
Linguistics. Linguistics. Fiction. Literary criticism.
Geography. Biographies. History.