The economic and social benefits of early childhood education : hearing before the Subcommittee on Education and Health of the Joint Economic Committee, Congress of the United States, One Hundred First Congress, first session, May 1, 1989
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The economic and social benefits of early childhood education : hearing before the Subcommittee on Education and Health of the Joint Economic Committee, Congress of the United States, One Hundred First Congress, first session, May 1, 1989
（S. hrg., 101-298）
U.S. G.P.O. : For sale by the Supt. of Docs., Congressional Sales Office, U.S. G.P.O., 1989