Columbia subject headings:
Narcotics.
Opium Conference (1st : 1924-1925 : Geneva, Switzerland)
Opium Conference (1st : November 3, 1924 - February 11, 1925 : Geneva)
Opium Conference (2d : November 17, 1924 - February 19, 1925 : Geneva)
Opium Conference (2nd : 1924 November 17-1925 February 19 : Geneva, Switzerland)
Opium trade.
Opium.
Harvard subject headings:
Opium
Opium Conference (1st : 1924 Nov. 3-1925 Feb. 11 : Geneva, Switzerland)
Opium Conference (1st : 1924-1925 : Geneva, Switzerland)
Opium Conference (1st : November 3, 1924-February 11, 1925 : Geneva, Switzerland)
Opium Conference (2nd : 1924 : Geneva, Switzerland)
Opium Conference (2nd : 1924 Nov. 17-1925 Feb. 19 : Geneva, Switzerland)
Opium Conference (2nd : November 17, 1924-February 19, 1925 : Geneva, Switzerland)
Opium trade
Princeton subject headings:
Opium Conference (1st : Geneva : Nov. 3, 1924-Feb. 11, 1925)
Opium Conference (2nd : Geneva : Nov. 17, 1924-Feb. 19, 1925)
Opium trade.
Opium.