The Archaeology of Kumaon Region, North India by Jeewan Kharakwal
Bulletin of the Deccan College Research Institute
Vol. 58/59 (1998-1999),
https://www.jstor.org/stable/42930546
An Introduction to Rock Art in India
http://shodhganga.inflibnet.ac.in/bitstream/10603/202775/8/08_chapter%201.pdf
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