Columbia subject headings:
Harvard subject headings:
Chevallier, Joseph--Journeys--Laos.
Chevallier, Joseph--Journeys--Vietnam--Tonkin.
Chevallier, Joseph--Travel--Laos.
Chevallier, Joseph--Travel--Vietnam, Northern.
Laos--Description and travel.
Vietnam, Northern--Description and travel.
Princeton subject headings:
Chevallier, Joseph--Travel--Laos.
Chevallier, Joseph--Travel--Vietnam--Tonkin.
Laos--Description and travel.
Tonkin--Description and travel.