O'Brien/Huston, The NICHD Study of Early Child Care, Kansas Site, `KU# 4896-9, Contract File, November 1, 1997, Box: 54, Folder: 11. University of Kansas Schiefelbusch Institute for Life Span Studies records, RG 35. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/455201 Accessed May 14, 2025.