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ICPSR has the Early Head Start Research and Evaluation (EHSRE) study but it only has the public use file. Where is the restricted version of the data and what are the access conditions?
ICPSR distributes the public-use version of the data through its Research Connections project.
The restricted-use version of these data are managed by the Henry A. Murray Research archive at Harvard University.
Descriptive information about the available files as well as information on the application process can be found on their website:
Type in early head start in the search box. Click on the link to the data. Under the "Documentation, Data and Analysis" tab you will see a reference to the restricted data and access conditions.