George Herbert Mead taught philosophy and social psychology at the University of Chicago for almost 40 years (from 1894 until his death in 1931).
During those years he published many articles and book reviews, but not a single book that contains his theories. After his death, some of his former students published his theories in four volumes. The most important volume is called Mind, Self & Society and was edited by Charles W. Morris (1934). This e-book contains the text corpus from this edition, but does not contain the foreword and remarks by Morris.