© Ralph M. Barnes; 29Mar49; MP4185.
THE WORK OF THE ATMOSPHERE. Encyclopaedia Britannica Films, Inc., c1946. 1 reel, sd., 16mm. In Greek.
© Encyclopaedia Britannica Films, Inc.; 11Jun46; MP804.
THE WORK OF THE KIDNEYS. Britannica Films, Inc., in collaboration with Anton J. Carlson, H. G. Swann, and F. J. Mullin, c1946. 1 reel, sd., b&w, 16mm. Afrikaans version. Title on script: "Die Werk van die Niere."
© Encyclopaedia Britannica Films, Inc.; 3Jul46; MP1873.
THE WORK OF THE KIDNEYS. Erpi Classroom Films, Inc., c1940, 1 reel, sd.
© Erpi Classroom Films, Inc.; 20Sep40; MP10696.
THE WORKING OF MAGNESIUM. Presented by The Dow Chemical Co. sd., b&w.
Appl. author: Jam Handy Organization, Inc.
© The Dow Chemical Co.; title & descr. 25Feb44; 5 prints, 21Feb44; MU14515.