Dear friends, you must have seen the some strange lengthy number written as ISBN most probably at the back cover of a book. Do you know its significance? Let us discuss:

ISBN is an abbreviation of “International Standard Book Number”. ISBNs used to be of  10 digits in length up to the end of December 2006, but since January 1st, 2007 they have consisted of 13 digits. Continue reading “ISBN”

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