Desirable pairing of two limited edition books signed by Eugene O'Neill, both published by Boni & Liveright in 1928. Includes: Strange Interlude (numbered 323/775); and The Emperor Jones (numbered 767/775). The Emperor Jones is housed in a custom-made red quarter-leather slipcase, and lacks its dust jacket (detached front flap laid in). In overall very good to fine condition, with a gift inscription and large bookplate inside The Emperor Jones, and mottled overall foxing to the boards of Strange Interlude.