Main contributor
- Casper J. Kraemer1
- Citizens for Clean Air1
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- Eddie Fisher1
- Edward S. Corwin1
- Encyclopaedia Britannica Films Inc.1
- Encyclopaedia Britannica Films, Inc.1
- Encyclopaedia Britannica Films, inc.1
- Evelyn Gould1
- F. W. Keller1
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- Furth Ulman1
- GT&E1
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