By John Holt
By P.V.R.K.Prasad
By Carl Sagan And Translated By V.Srinivasa Chakravarthy
By Thenneti Suri
By K B Gopalam
By Tadanki Venkata Lakshmi Narasimha Rao
By Azad
By Dr Chaganti Surya Narayana Murty
By Rachapalem Chandra Shakarareddy
By Simha Prasad
By Adapa Chiranjeevi
By Lohi Choichi Koran
By Karlapalem Hanumantarao
By Janrdhan Thakur, Hyd
By Kavanamali
By Chembolu Srirama Sastri
By Dr Paruchuri Gopalakrishna
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