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![Cover for Ernest L. Cowles · An Introduction to Survey Research, Volume II: Carrying Out the Survey (Paperback Book) [Second edition] (2019)](https://imusic.b-cdn.net/images/item/original/284/9781949991284.jpg?ernest-l-cowles-2019-an-introduction-to-survey-research-volume-ii-carrying-out-the-survey-paperback-book&class=scaled&v=1654740664)
![Cover for Ernest L. Cowles · An Introduction to Survey Research, Volume I: The Basics of Survey Research (Paperback Book) [Second edition] (2019)](https://imusic.b-cdn.net/images/item/original/053/9781948976053.jpg?ernest-l-cowles-2019-an-introduction-to-survey-research-volume-i-the-basics-of-survey-research-paperback-book&class=scaled&v=1635554051)