It is an inevitable phenomena that the reading materials will become obsolete due to changes in thought content, language, style of presentation and usage of terminology and document carrier. The author discusses in this paper how reading materials have become obsolete over the years due to changes in thought content, language, style of presentation and usage of new terminologies and deterioration in physical body or document carrier. The continuous activity of research by various scientists/technologists have resulted in new discoveries and disproving the old theories. It is also brought out that language could contribute to obsolescence of reading materials apart from deterioration in document carrier.
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