The Lost Media Wiki is a wiki that compiles what information that can be found about the existence of various media that have disappeared off the face of the planet.
It’s a useful resource to confirm that weird things from your youth, that only you remember, did, in fact, exist. I was really happy to learn that a cartoon from when I was little, The Bush Baby, actually existed and wasn’t just a fever dream. But then I was sad that there is no trace of the English dub to be found anywhere. Not even a clip.
If you want to help them out, check out what exists on old VHS tapes and magazines and such in your basement.