“ History of Austria, Liechtenstein, Hungary, and Czechoslovakia is a classification used by the Library of Congress Classification system under Class D -- History, General and Old World. This article describes subclass DB.
Contents DB
1-3150..........History of Austria. Liechtenstein. Hungary. Czechoslovakia 1-879..........Austria. Austro-Hungarian Empire 1-20.5..........General 21-27.5..........Description and travel 29-34.5..........Antiquities. Social life and customs. Ethnography 35-99.2..........History 35-40.5..........General 42-49..........Military, naval, and political history. ”

“ Foreign relations 51-99.2..........By period 51-64..........Early and medieval to 1521 60-64..........Wars with the Turks 65-99.2..........1521- 65.2-65.9..........1521-1648 66-69.5..........1648-1740 69.7-77..........1740-1815 80-99.2..........19th-20th centuries 83..........Revolution, 1848 96-99.2..........Republic, 1918- 99-99.1..........1938-1955. ”