Columbia subject headings:
Harvard subject headings:
Greeks--Asia, Central--History.
Greeks--Asia, Southern--History.
Silk Road--Description and travel.
Silk Road--History.
Princeton subject headings:
Chalikias, Sōtērēs--Travel.
Greeks--Asia, Central--History.
Greeks--Asia, Southern--History.
Silk Road--Description and travel.
Silk Road--History.