We're Here! identifying analog media. In the days before VCRs and video cassettes, there were movies. Movies had images on transparent acetate film, and the images hardly changed from one to the next. But when they were projected on a screen at about 24 images per second, human beings would see what appeared to natural motion.
This pile of movies includes some 1960s and 1970s topics of technical careers, computers, and space exploration. The only way I'll see them is if they are available on the internet archive.