Jennifer Hunter Childs and Nathan Jurgenson. (2011). Behavior Coding of the 2010 Nonresponse Followup (NRFU) Interviews Report. Center for Survey Measurement, Research and Methodology Directorate (Survey Methodology #2011-10). U.S. Census Bureau. Available online at <http://www.census.gov/srd/papers/pdf/ssm2011-10.pdf>.
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