http://dewey.info/scheme/e22/
970 History of North America
973 United States
http://dewey.info/scheme/a14/ 973 United States
973.1 Early history to 1607 973.2 Colonial period, 1607–1775 973.3 Periods of Revolution and Confederation, 1775-1789 973.4 Constitutional period, 1789–1809 973.5 1809-1845 973.6 1845-1861 973.7 Administration of Abraham Lincoln, 1861-1865    Civil War 973.8 Reconstruction period, 1865–1901 973.9 1901-
http://dewey.info/scheme/edition/e23/
97 History of North America
973 United States
973.03 United States--encyclopedias 973.0431 German Americans 973.0451 Italian Americans 973.0468 Hispanic Americans (U.S.) 973.04924 Jews--United States 973.0495 Asian Americans 973.0496073 African Americans 973.0497 American native peoples--United States 973.099 Presidents--United States--collected biography 973.1 Early history to 1607 973.2 Colonial period, 1607-1775 973.3 Periods of Revolution and Confederation, 1775-1789 973.4 Constitutional period, 1789-1809 973.5 1809-1845 973.6 1845-1861 973.7 Administration of Abraham Lincoln, 1861-1865 973.8 Reconstruction period, 1865-1901 973.9 1901-
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