Ohio Anti-Slavery Society: Narrative of proceedings against the liberty of the Press in Cincinnati. Cincinnati, 1836; Historical and Philosophical Society of Ohio, Quarterly Publication, vols, x, xii. 1915-17, Cincinnati.
Ohio Hundred Year Book: A handbook of the Public Men and Public Institutions of Ohio, 1879-1901. Columbus, 1901.
Orth, Samuel Peter: The Boss and the Machine. New Haven, 1919.
Ostrogorski, M.: "De l'organisation des partis politiques aux Etats Unis." Paris, Fr., 1889.
Paine, Albert Bigelow: Thomas Nast—his period and his pictures. Macmillan, New York, 1904.
Paine, Thomas: The Genuine Trial of Thomas Paine, etc. London, 1793; (See Conway, Moncure Daniel; Birrell, Augustine; Cobbett, William; Cheetham, James; Carlile, Mary Anne.)
Palfrey, John Gorham: History of New England, 5 vols. Boston, 1858-1890.
Parton, James: Famous Americans of Recent Times. Houghton Mifflin & Co., Boston, 1884; Life of Thomas Jefferson. Boston, 1874.
Parton, James: Life of Horace Greeley, 1893 Edition. Houghton Mifflin & Co., Boston, 1893; Life of Andrew Jackson, 3 vols. New York, 1860.
Patton, Jacob Harris: Political Parties in the United States. (New Amsterdam Book Co.), New York, 1902.
Pellew, George: John Jay. Boston, 1892.
