• 321 Wisconsin Historical Society Library
• 12 Memorial Library
• 12 Wisconsin Historical Society Archives
• 3 WHS State Archives Preservation Facility

• 11 Microforms

• 516 Slavery
• 216 Extension to the territories
• 87 Compromise of 1850
• 72 History
• 46 Statehood (American politics)
• 36 Tariff
• 35 Mexican War, 1846-1848
• 34 United States
• 32 Foreign relations
• 32 United States. Congress. House
• 30 Secession
• 28 Reconstruction (U.S. history, 1865-1877)
• 25 Campaign literature
• 25 States' rights (American politics)
• 24 Constitutional law
• 24 Contested elections
• 20 United States. Congress
• 17 Appropriations and expenditures
• 16 Controversial literature
• 16 Kansas-Nebraska Act
• 16 Lecompton constitution
• 15 Public lands
• 14 Constitution
• 13 Foot's resolution, 1829

• 135 United States. Congress. House
• 54 United States. Congress. Senate
• 52 Seward, William H. (William Henry), 1801-1872
• 35 Sumner, Charles, 1811-1874
• 30 United States. Congress (34th, 1st session : 1855-1856). House
• 27 United States. Congress (31st, 1st session : 1849-1850). House
• 25 Adam Matthew Digital (Firm)
• 22 Douglas, Stephen A. (Stephen Arnold), 1813-1861
• 22 Webster, Daniel, 1782-1852
• 17 Giddings, Joshua R. (Joshua Reed), 1795-1864
• 17 Sallie Bingham Center for Women's History and Culture
• 14 United States. Congress (35th, 1st session : 1857-1858). House
• 12 Hale, John P. (John Parker), 1806-1873
• 12 United States. Congress (31st, 1st session : 1849-1850). Senate
• 12 United States. Congress (35th, 1st session : 1857-1858). Senate
• 11 Benjamin, J. P. (Judah Philip), 1811-1884
• 11 Cass, Lewis, 1782-1866
• 11 Wilson, Henry, 1812-1875
• 10 Stephens, Alexander H. (Alexander Hamilton), 1812-1883
• 10 United States. Congress
• 9 Bingham, John Armor, 1815-1900
• 8 Collamer, Jacob, 1791-1865
• 8 Hunter, R. M. T. (Robert Mercer Taliaferro), 1809-1887
• 8 Stevens, Thaddeus, 1792-1868
• 8 United States. Congress (33rd, 1st session : 1853-1854). House

• 1,067 English
• 2 German
• 1 Spanish
• 1 Tagalog

• 936 United States
• 302 Kansas
• 91 California
• 16 New Mexico
• 14 Texas
• 11 Southern States
• 10 Massachusetts
• 10 Nebraska
• 9 Great Britain
• 7 France
• 7 Oregon Territory
• 7 Philippines
• 6 New York (State)
• 5 Mexico
• 4 Utah
• 3 Louisiana
• 3 Minnesota
• 3 New Jersey
• 3 Oregon
• 3 Puerto Rico
• 3 Spain
• 3 Tennessee
• 2 Alabama
• 2 China
• 2 Cuba

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