Bulk of primary source literature appears in the form of periodicals. The periodical article is the main means of communication for the exchange of scientific information. The same can be said for many other areas of Knowledge. Information contained in periodicals is almost invariably more upto date than that appearing in books. Information on news processes and discoveries can appear in a periodical with in weeks of their formulation. How ever, the same might take two or three years before the same can appear in book form.
   
            The experience shows that most of the material reported in periodicals is never published in books. To capture the situation all the back volumes are bound & preserved.
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