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tools and types in technical services general services(secondary services) technical ser types of services modern public libraries enlightenment era libraries islamic lands classical period national libraries european middle ages late antiquity early libraries types of collection development process of collec function of collection development historical background collection management library collection development development library collection collection library classification systems/schemes dewey deci types of book classification schemes function of book classification schemes purpose of book classification schemes theory of classification library classification concept of classification classification researcher propose document written research proposal review of literature is one of the most important argumentative review why do we write literature review and summarizing scholarly materials evaluating analyzing the process of reading review of literature research process udc classification islamic knowledge ddc loc ddc