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Valmiki Ramayana
The epic whose Bala Kanda tells Ganga's descent and makes her Himavat's daughter, whose Uttara Kanda has Ravana lift Kailash, and whose Yuddha Kanda is cited for Rama's linga at Rameswaram.
Sources: Ganga (goddess) — Wikipedia; Ravananugraha — Wikipedia; Ramanathaswamy Temple — Wikipedia · see Valmiki Ramayana's web