Columbia subject headings:
Arabian Peninsula--Description and travel.
Arabs.
Bedouins.
Caravans.
Iraq--Description and travel.
Syria--Description and travel.
Trade routes.
Harvard subject headings:
Arabian Peninsula--Description and travel.
Arabs
Bedouins
Caravans
Iraq--Description and travel.
Syria--Description and travel.
Trade routes
Princeton subject headings:
Arabian Peninsula--Description and travel.
Arabs.
Bedouins.
Caravans.
Iraq--Description and travel.
Syria--Description and travel.
Trade routes.