ace books mmpb undated° second (including first printing ½ D-229 (1958), q.v.) retaining same
cover art by ed emshwiller (signed "emsh" on building at right hand edge visible on some copies, guillotined off others in production), new ace books logo, new
cover price 40¢
192pp. including titles, indicia etc, end pp. advertising
° - publication date given presumably taken from donald h. tuck