Doing some research on the history of photography lead me to “The Branding of Polaroid,” a remarkably detailed look at the development of the Polaroid brand, by a principal instigator. It’s rich with stories, images, and perspective — there’s enough content for a small book! It’s a bit tricky to navigate — use the “chapters” listed under “Archives” to go from beginning to end.
Update: I just remembered this page on the evolution of Kodak’s brand logo. It’s fascinating to see it improve until 1971, at which point it seems to backslide, with the numbingly bland mark they have now: