The Silk Road and Other Eurasian Routes in Greco-Roman Times
Map shows Main Silk Routes, Indian Grand Road, and Eurasian Steppe Route. It additionally indicates Main Connecting Land and Sea Routes, the Fortified Wall, and several passes.
The Silk Road was a main route for the export and import of medicinal products and spices, as well as silk, particularly during Greco-Roman times.
To the Ends of the Earth: The Great Travel and Trade Routes of Human History (p. 376)
Facts on File Publications, New York and Oxford, 1984.
Irene M. Franck and David M. Brownstone.