A blogger who identifies themselves only as PW1949 has been posted very erudite and carefully researched blogs on everything to do with the 19th Arrondissement in Paris. This includes the Buttes Chaumont area where the Gaumont Studios were.
If you can read French, I highly recommend visiting this blog. Even if you can't, the pictures and maps are great.
Why write about Buster Keaton in a blog dedicated to early cinema and Alice Guy? Because Herbert Blaché, Alice's husband, directed a few films in Hollywood before the transition to sound, and one of them was The Saphead, the first feature film starring Buster Keaton.
One thing that is true of all early cinema, silent cinema, and early talkies: without preservation and conservation, the films eventually disintegrate. That's if we even know where they are to begin with.