13 May 2015
This is a report published by Pew Research Center on May 2015.
american trends panel
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Keeter, S., 2015. From Telephone to the Web: The Challenge of Mode of Interview Effects in Public Opinion Polls, Pew Research Center Methods. Retrieved from https://policycommons.net/artifacts/619120/from-telephone-to-the-web/1600179/ on 28 Sep 2022. CID: 20.500.12592/8wc2tm.
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