00302nam a2200109Ia 450000500170000000800410001708200140005810000170007224500470008926000480013630000080018420260225051010.0260224s9999||||xx |||||||||||||| ||und||  a151.1 KRE  aDavid Krech  0aTheory and problems of special psychology   aSingapore: McGraw-Hill Int. Book Co. c1948  a637