When Thomas Edison introduced the Kinetoscope in April 1894, it used a film that was almost identical with the 35mm film used today.
You can still get started in Medium Format Film Photography in 2022, by Dmitrii Eliuseev, Geek Culture
Dunkirk is playing in a lot of formats. Here's how each affects your viewing experience. - Vox
Why are most movies shot and released in 2.21:1 when most modern screens have a 16:9 aspect ratio? - Quora
The Cinematography of First Man - Neil Oseman
Film Frame Dimensions
The Story Behind That Picture 243 - How Leica was setting the 35mm standard
35 mm movie film - Wikipedia
Is 35mm Still Made? and other common questions
The History of Photography: The Development of Colour Film
Mitchell FC Fox Grandeur Camera
History of the Camera: When was Photography Invented? - Adorama
Man Creates a Working 35mm Movie Camera with 3D Printing