Readings in Extraversion-Introversion in three volumes

1st US edition 3 Volume set; comprehensive collection of scientific papers on Extraversion and Intraversion; volume 1 Theoretical and Methodological Issues; volume 2 Fields of Application; volume 3 Bearings on Basic Psychological Processes; all vols with mild worn patches to endpapers, mild scattered foxing; vols 1 & 2 clipped to front endpaper, o.w. Very Good; vol 3 Very Good; dustwrappers lightly edgeworn and rubbed, vols 1 & 2 have one or two short closed tears, o.w. Very Good; dustwrapper vol. 3 lightly rubbed w/ closed tears at head and foot of spine, o.w. VG.