National Academy of Sciences-National Research Council Twin Registry (NAS-NRC Twin Registry), 1958-2013 [RESTRICTED] (ICPSR 36234)

These data have been updated since their release as https://doi.org/10.3886/ICPSR36234.v1, 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.