D410-(475) 20th century
D461-(475) Eastern question
D501-680 World War I (1914-1918)
D720-728 Period between World Wars (1919-1939)
D731-838 World War II (1939-1945)
D839-860 Post-war history (1945- )
D880-888 Developing countries
D890-893 Eastern Hemisphere
D900-2009 Europe (General)
D901-980 Description and travel
D1050-2027 History