PART ONE OF THIS BULLETIN PROVIDES HELP IN THE TWO CRITICAL AREAS OF MASTER TAPE PREPARATION AND DUPLICATION. SUPPLEMENTED BY NUMEROUS PHOTOGRAPHS AND DIAGRAMS OF EQUIPMENT AND DUPLICATION TECHNIQUES, THE BULLETIN DESCRIBES MASTER PROGRAM DUPLICATION USING LANGUAGE LABORATORY EQUIPMENT, A PROFESSIONAL MASS DUPLICATOR, A TAPE RECORDER, A RECORD PLAYER, A SOUND FILM PROJECTOR, AND A SHORT WAVE RADIO. IT EXPOUNDS FURTHER ON DUPLICATING SPEEDS AND CHOICE OF EQUIPMENT AND TAPE BEFORE CONCLUDING WITH A BIBLIOGRAPHY. PART TWO, SUGGESTIONS FOR LANGUAGE LABORATORIES, INCLUDES A DISCUSSION OF CRITERIA FOR DEVELOPING A LANGUAGE LABORATORY PHILOSOPHY, BASED ON THE SPECIFIC FACILITIES PROVIDED, AND DISCUSSES EQUIPMENT SELECTION AND THREE LABORATORY DESIGNS. ALSO IMPLEMENTED BY PHOTOGRAPHS AND DIAGRAMS, THIS SECTION CONTAINS REFERENCE LISTS OF EQUIPMENT MANUFACTURERS, AUDIOVISUAL AIDS SOURCES, AND A BIBLIOGRAPHY ON LANGUAGE LABORATORIES. (AB)