136.7 S Shirley, Mary Margaret, 1899- The first two years; a study of twentyfive babies, by Mary M.Shirley. Minneapolis, The University of Minnesota press (c1931-33). 3 v. front., plates, tables (1fold.) diagrs., forms. 20 cm (Half-title: University of Minnesota. The Institute of child welfare. Monograph series no. VI-VIII). Bibliography at end of each volume Contiene.