Columbia subject headings:
Imperialism--History.
Postcards--History.
Harvard subject headings:
Imperialism--History--Catalogs.
Koninklijk Instituut voor de Tropen--Ethnological collections--Catalogs.
Postcards--History--Catalogs.
Smet, Peter A. G. M. de--Ethnological collections--Catalogs.
Traditional medicine--History--Catalogs.
Princeton subject headings:
Catalogs.
Imperialism--History--Catalogs.
Koninklijk Instituut voor de Tropen--Ethnological collections--Catalogs.
Postcards--History--Catalogs.
Smet, Peter A. G. M. de--Ethnological collections--Catalogs.
Traditional medicine--History--Catalogs.