Nicolson, Harold, 1886-1968. The Congress of Vienna : a study in allied unity : 1812-1822 / by Harold Nicolson. - New York : Harcourt, Brace and company, 1961. - xiii, 312 p. : front., ports. 21 cm. Includes bibliographical references and index. Subjects--Corporate Names: Congress of Vienna, Subjects--Geographic Terms: Europe--Politics and government--1789-1815. Dewey Class. No.: 940.27 / NIC 1961