Play and development : a symposium / Maria W. Piers. Piers, Maria W., editor. Piaget, Jean, 1896-1980. Erikson Institute. Loyola University Chicago. School of Education. Loyola University Chicago. Department of Psychology. Play. Child psychology. Developmental psychobiology. Child Development. Play and Playthings. 136.5 PIP Six papers from a series of meetings planned by the Erikson Institute, the School of Education, and the Dept. of Psychology of Loyola University, as part of the university's centennial activities. Includes bibliographies. New York : Norton, 1972. 1972. 1972 Text 176 p.; eng