The article aims at disclosing the role and value of the depository collection of the Central Scientific and Technical Library of the Federal state budgetary scientific institution “Institute of scientific and technical information” (CSTL FSBSI “ISTI”) in preserving the cultural and scientific heritage of Donbass. The authors have analyzed the results of monitoring scientific and technical resources of the depository collection of CSTL within the framework of which, first, examined the coal industry resources and related industries, reflecting the peculiarities of the region and industries, urgent for the region at the present stage. The article traces the main stages of CSTL development, the opening of which is directly related to the post-war reconstruction of Donbass. The authors characterize the collection of rare and valuable publications, most of which are related to the coal industry, which contains fundamental works of famous scientists in this field, including those on the Donetsk coal basin, as well as domestic and foreign scientific and technical journals since 1826. In the conclusion, the problems of further development of CSTL depository collection are outlined, the priority tasks for preserving the documentary heritage of Donbass are proposed.
