00370nam a2200121Ia 450000500170000000800410001708200140005810000200007224500810009226000470017330000120022065000160023220240814115749.0240813s9999||||xx |||||||||||||| ||und||  a515.6 THU  aThurstone, L.L. 0aMultiple factor analysis: A development and expansion of the vectors of mind  aChicagobUniversity of Chicago Pressc1947  axx,535p  aMathematics