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Dental survey of school children, ages 6 - 14 years, made in 1933-34 in 26 states,

Messner, Clinton Thad, 1885-
Washington, U. S. Govt. print. off., 1936. 1936

Development during middle childhood : the years from six to twelve

National Research Council (U.S.). Panel to Review the Status of Basic Research on School-Age Children.
Washington, D.C. : National Academy Press, 1984. 1984