This simply announces the addition to what has become an annual institution- the Fireside series. Two Fireside Books of Baseball provide the clue to market, presentation, and kind of content. The editor has chosen 80 pieces -- fiction, news stories, interviews, fragments of longer works, poetry -- and spans the time from Homer to the present. Some are sensational, some colorful, some historical in interest, some of human interest. This will sell in the category with the best of its kind.