For the first time library selection is explored as a systemic phenomenon that has been formed under the influence of the changes in external environment. The main steps of the development of the theory of library selection have been determined that made it possible to reveal the prerequisites of transformation of library choice into library selection of documents and its place in the technology cycle of formation of library collection in different historic periods. On the base of concretization of its main processes the author has substantiated the quantitative composition and content filling of the main types of library selection under conditions of informatization.
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