Search Results Use the search box below to revise your search, or start a new search. Studies (2) Variables Publications Your query returned 2 studies. Series results are grouped under the most relevant study. Ungroup series results to view all results. Sort by: Title A-Z Released/Updated Time Period Most Cited in ICPSR Bib. 1. National Center for Research on Early Childhood Education Teacher Professional Development Study (2007-2011) (ICPSR 34848) Pianta, Robert; Burchinal, Margaret 2. State of Preschool Yearbook: State-Funded Pre-K Program Data, 2011-2012 School Year (ICPSR 34942) Barnett, W. Steven; Carolan, Megan E.