Subject categories
Documentary
Documentary → Documentary films - United States
Education, Instruction, Teaching & Schools → Science - Study and teaching
Educational & Instructional
Educational & Instructional → Educational films
Educational & Instructional → Instructional
Food, Health, Lifestyle, Medicine, Psychology & Safety → Ear
Food, Health, Lifestyle, Medicine, Psychology & Safety → Hearing
Food, Health, Lifestyle, Medicine, Psychology & Safety → Human physiology
Mathematics, Science & Technology → Hearing
Mathematics, Science & Technology → Physics
Mathematics, Science & Technology → Science - Experiments
Mathematics, Science & Technology → Science - Study and teaching
Mathematics, Science & Technology → Sound
Mathematics, Science & Technology → Sound - Experiments
People → Edison, Thomas A. (Thomas Alva), 1847-1931
Short films
Short films → Short films - United States