International directory of mental retardation resources / edited by Rosemary F. Dybwad.
- Washington : U.S. Dept. of Health, Education, and Welfare, President's Committee on Mental Retardation, 
- Government document
ix, 360 p. ; 28 cm.
- [2d ed.] rev. 1977-78.
- United States. Dept. or Health, Education, and Welfare. DHEW publication ; no. (OHDS) 79-21019.
[DHEW publication ; no.] (OHDS) 79-21019