What subjects do the call letters & numbers cover?
E11-143 America.
E151-889 United States.
E151-169.12 General.
E186-199 Colonial history (1607-1775).
E201-298 The Revolution, 1775-1783.
E300-453 Revolution to the Civil War, 1775/1783-1861.
E456-655 Civil War period, 1861-1865.
E660-738 Late nineteenth century, 1865-1900.
E740-837.7 Twentieth century.
E838-889 Later twentieth century, 1961-2000.
E895-904 Twenty-first century.