NICHD Study of Early Child Care and Youth Development: Phase IV, 2005-2007 [United States] (ICPSR 22361)

These data have been updated since their release as https://doi.org/10.3886/ICPSR22361.subscribe, which you used to locate the data. If you need access to a previous version of the data (e.g., to replicate results in an article or report), you can contact ICPSR User Support to find out if a prior version is available.