"Reprinted 1967, 1968, 1970, 1972"--P. [2] of cover
Includes index
Physical description for original version: 98 p. : 24 cm
原資料等に関する注記
原資料の出版事項: [Washington, D.C.?] : U.S. Dept. of Health, Education, and Welfare, Office of Child Development, Children's Bureau : For sale by the Supt. of Docs., U.S. G.P.O., 1980