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 Early Development and Learning Multistate Study of Pre-Kindergarten, 2001-2003 (ICPSR 4283) Clifford, Dick; Bryant, Donna; Burchinal, Margaret; et al. 2. Pre-Kindergarten in Eleven States: NCEDL's Multi-State Study of Pre-Kindergarten and Study of State-Wide Early Education Programs (SWEEP) (ICPSR 34877) Early, Diane; Burchinal, Margaret; Barbarin, Oscar; et al.