Sources (Beyond The Perf, Stamp News Now) seem to indicate that the Twentieth-Century Poets stamps set, which includes Sylvia Plath and Theodore Roethke among others, will be released on 21 April 2012.
The other poets recognized, as Forever Stamps, are Elizabeth Bishop, Joseph Brodsky, Gwendolyn Brooks, E. E. Cummings, Robert Hayden, Denise Levertov, Wallace Stevens and William Carlos Williams.
The other poets recognized, as Forever Stamps, are Elizabeth Bishop, Joseph Brodsky, Gwendolyn Brooks, E. E. Cummings, Robert Hayden, Denise Levertov, Wallace Stevens and William Carlos Williams.