Linked from
The 21 pages that link to Periplus of the Erythraean Sea, each with the reason it gives.
Spice tradeRelated: It records early spice routes and the merchants and ports involved in them.
FrankincenseRelated: It describes ports and commerce linked to the movement of Arabian aromatics.
TamilakamRelated: Its coastal descriptions offer an external view of trade in the Tamil region.
AdulisRelated: It describes Adulis as a key port and records goods traded there.