Story of origin of Ganga narrated in valmiki ramayan -
(Photo courtesy of Nick Barootian '02)
1) Saroj Bala and Kulbhushan Mishra. 2012. Historicity of Vedic and Ramayan Eras: Scientific Evidences from the Depths of Oceans to the Heights of Skies. Institute of Scientific Research on Vedas. Abridged editions also available in English and Hindi.
Srimad Valmiki Ramayana (Hindi)
Srimad Valmiki Ramayana (English)