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From September, 1939, to V-J Day in 1945 the Office of Public Opinion Research maintained a continuous survey of American public opinion regarding major wartime issues. Much of the information obtained in the course of this survey was used in preparing trend charts, presented below, showing the fluctuation of opinions in relation to events during the war. A number of generalized psychological principles applying to opinions have been formulated, treating opinion as a particular variety of perception.
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Hadley Cantril (1948) studied this question.
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