. . . . . . . . . . . . "Carl Iver Hovland papers"@en . "Correspondence, reports, writings, research records and memoranda from professional organizations, all related to his work in the field of communications and the modification of beliefs and attitudes. One-quarter of the papers consists of professional correspondence (1943-1959)."@en . . . . . . . . . . . . . . . . "Behaviour modification." . .