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DIGITAL TEXT BOOK My digital text book is on the chapter world of carbon of 9th standard. I included four chapter which were Chapter -1 Carbon. Chapter -2 Allotropes of carbon. Chapter -3 Amorphous carbon. Chapter-4 Organic compounds. I incorporated hyperlink and QR codes for interactive study of the students Here is the link for my digital text book. https://online.fliphtml5.com/nbvgt/fmqu/index.html