Camphor appears in the Sushruta Samhita, an Ayurvedic compilation whose textual layers and dating are themselves disputed, and in early medieval Chinese and Arabic sources, without the relative priority of these candidate mentions having been established here.
What would resolve this A philological study fixing the earliest securely datable layer of the Sushruta Samhita naming camphor, compared against the earliest dated Chinese or Arabic trade record for it.
OpenPhilology, history of medicineMircea Eliade (ed.); Lindsay Jones (ed., 2nd ed.), Encyclopedia of Religion