According to the zero - growth theory of library collection, this paper approaches the retention period about the back number of periodicals in library.

摘要本文依据“藏书零增长理论”对图书馆过期期刊的保存期问题进行探讨。

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Back copy: Out-of-date issue of magazines or periodicals. Also called Back number.

过期刊物：过时的杂志或定期刊物。

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