000			00303nam a2200109Ia 4500
001			80693
008			170722s9999 xx 000 0 und d
100			_aSchiefelbusch, Richard L.
245			_aLanguage and mental retardation. _bEmpirical and conceptcal considerations. /
260			_c1967.
942			_cGEN
999			_c74729 _d74729