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- "Albert I.," in Encyclopædia Britannica (12th ed., 1922)
- "Belgium," in Encyclopædia Britannica (12th ed., 1922) (with Henri Pirenne)
Some or all works by this author are in the public domain in the United States because they were published before January 1, 1928.
The longest-living author of these works died in 1972, so these works are in the public domain in countries and areas where the copyright term is the author's life plus 50 years or less. These works may be in the public domain in countries and areas with longer native copyright terms that apply the rule of the shorter term to foreign works.