Importation and use of opium. Hearings before the Committee on Ways and Means of the House of Representatives, 61st Congress, 3d session on H. R. 25240, H. R. 25241, H. R. 25242, and H. R. 28791, December 14, 1910 and January 11, 1911
United States. Congress. House. Committee on Ways and Means