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A 1960 film made at the Groningen University Medical Physics Department, Physiological Laboratory by Janwillem van den Berg, William Vennard, "D. Burger and C. Shervanian". "Illustrates the physiological aspects of voice production. Includes an in depth discussion of the anatomy of the larynx, and the role each part plays."
From Vennard's slides: "Groningen NL Physiology Lab - Movies of the Vocal Cords"