01098nam a2200301Ia 4500 179105 BIBL 20190327111136.0 770812s1977 ohu bp 00110 eng 76049380 //r842 0675085268 n-us--- BUCG RC570 .E34 1977 362.3/07/7 362.3077 E33i2 Ehlers, Walter H. Local 90742 An introduction to mental retardation a programmed text Walter H. Ehlers, Curtis H. Krishef, Jon C. Prothero. 2d ed. Columbus, Ohio Merrill c1977. xv, 384 p. Includes bibliographies and index. Mental Retardation Programmed instruction. Local 135273 Mentally handicapped children Services for United States Programmed instruction. Local 135287 Developmental disabilities Programmed instruction. Local 86203 Krishef, Curtis H., joint author. Local 121621 Prothero, Jon C. joint author. Local 154451 137353 137353 0 0 lc 0 RC_570_000000000000000__E34_1977 0 mbl 91985 12 12 20 2016-05-27 265046 0 RC 570 .E34 1977 50000001907046 2016-05-27 00:00:00 r:179105 z:NCC:D 6