By Balala Science Vignanam
N.Mohan Krishna
T.V.Venkateswaran
Pro. N.Venugopala Rao And Pro. K.Satya Prasad
P V Ranganayakulu
Swathi Book House
P.Lakshmi Devi
Mukthavaram Pardhasaradhi
Balala Science Vignanam
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