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* Delhi Iron Pillar: New Insights. R. Balasubramaniam, Aryan Books International, Delhi, and Indian Institute of Advanced Study, Shimla, 2002, Hardbound, . [http://www.infinityfoundation.com/mandala/t_rv/t_rv_agraw_delhi_frameset.htm] [http://home.iitk.ac.in/~bala/journalpaper/journal/index.htm]
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* [http://home.iitk.ac.in/%7Ebala/journalpaper/journal/journalpaper_20.pdf New Insights on the 1600-Year Old Corrosion Resistant Delhi Iron Pillar], R. Balasubramaniam, Indian Journal of History of Science 36 (2001) 1–49.
* The Early use of Iron in India, Dilip K. Chakrabarti, Oxford University Press, New Delhi, 1992, .