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Journal Article The Usefulness of a Post Card Technique in a Mail Questionnaire Study Get access KENNETH BRADT KENNETH BRADT Department of Defense Search for other works by this author on: Oxford Academic Google Scholar Public Opinion Quarterly, Volume 19, Issue 2, Summer 1955, Pages 218–222, https://doi.org/10.1086/266565 Published: 01 January 1955
Kenneth H. Bradt (Sat,) studied this question.