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4. Basic Statistics of NER 2006. viewed on 9 May 2013 http://www.asthabharati.org/Dia_Jan%2009/the%20N.E.%20ind.htm .
5. Bhambri, R., Bolch, T., Chaujar, R. K., & Kulshreshtha, S. C. (2011). Glacier changes in the Garhwal Himalaya, India, from 1968 to 2006 based on remote sensing. Journal of Glaciology, 57, 543–556.