Thurstone, L.L. 1887-1955. Multiple-factor analysis : a development and expansion of The vec tors of the mind / by L.L. Thurstone. - Chicago, Ill. : The University of Chicago Press, 1947. - xix, 535 p. : ill., diagrs. ; 24 cm. Bibliographical foot-notes. Subjects--Topical Terms: Factor analysis.Mental tests.Psychology-- Methodology. Dewey Class. No.: 151.2651 THU