THE DISCOVERY OF THE FUTURE ... SPEECH DELIVERED BY GUEST OF HONOR AT 3D WORLD SCIENCE FICTION CONVENTION, DENVER, INDEPENDENCE DAY 1941. RECORDED ON DISCS BY WALTER J. DAUGHERTY, TRANSCRIBED BY ASSORTED SERVICES, PRESENTED BY FORREST J. ACKERMAN ... [cover title]. [Los Angeles]: A Novacious Publication, . Octavo, spirit duplication, printed wrappers, stapled. First edition. Limited to 200 copies. Heinlein's first separate publication, preceding ROCKET SHIP GALILEO by six years. Tiny chip from lower right corner of front cover, small tear in rear cover at lower left corner, rear cover pulled away from top staple, a nearly fine copy with minimal rust to staples. A very nice copy overall. (#136718).