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I agree, it's a shame this content can't be enjoyed by more.
It's my view that it just isn't user friendly, it's very hard to 'see at a glance' what's available. You follow a route where you think you'll find what you're looking for & just get lead down a blind alley.
Also, A,B,C... navigation is not great, you need to devise taxonomy which lists exactly what's available so, a simple directory of manufacturers which then expands when clicked on to show availability of old brochures, users gallery etc.
Also, I don't know what lengths are made here to add appropriate meta data to ensure content is retrieved via search but it appears this isn't working also.
Are scanned PDF files actually hosted on the site or do links go to users servers. PDF isn't great as some users don't have the fast download speeds. Is there a way you can scan & host the files on the site as an html file? It would make for a faster page.
I know this site isn't Amazon or BBC but a user will come back to a site where they think they can get to their destination with the least number of steps/clicks in the least amount of time.