TY  - BOOK
AU  - Ehlers,Walter H.
AU  - Krishef,Curtis H.
AU  - Prothero,Jon C.
TI  - An introduction to mental retardation: a programmed text
SN  - 0675085268
AV  - RC570 .E34 1977
U1  - 362.3/07/7 
PY  - 1977///
CY  - Columbus, Ohio
PB  - Merrill
KW  - Mental Retardation
KW  - Programmed instruction
KW  - Local
KW  - Mentally handicapped children
KW  - Services for
KW  - United States
KW  - Developmental disabilities
N1  - Includes bibliographies and index
ER  -