Offtopic » Where to look for lost films?

Hi,

Where do people usually look for lost films from around the early 1900's - 1920's? I've been around flea markets and antique shops and haven't found anything from the silent era. No posters, no magazines, no nitrate. Where would be the best place to start looking?


Please help.

I didn't find the right solution from the Internet.

References:-
http://www.nitrateville.com/viewtopic.php?f=7&t=21917
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Thanks!