k:.,,~o1 - ANNO DoMINI: Three Stones. by George Steiner (Atheneum, $3.95) BAD CHARAC'l'ERS, by Jean Stafford (Farrar, Straus & Giroux, $~.95). Nine short stories and a novella. MICHAEL SHAYNE'S 50TH CASE, by Brett Halliday (Dodd, Mead, $3.50). A Torquil detective story. 125TH A::->N!VERSARY ANTHOLOGY: A sampling of Reading Tastes from the Lists of an American Pub lisher, selected by the editors of Dodd, Mead (Dodd, Mead, $5). ROOTS AND BRANCHES, Poems by Robert D...