Opium smoking in China, Charles J. H. Halcombe (1896)
Opium Den Concession at 1893 Chicago World’s Fair
White Women in Opium Den, Chinatown, S. Francisco,
From Album of views of California and the West Canada and China, ca. 1885
Underground opium den. [T.E. Hecht.], The Bancroft Library. University of California, Berkeley.