I found myself in need of a manual for the Ithaca 900 that I bought last weekend. It seems to shoot fine, but it's kind of gunky inside. I'm the sort who likes to have a manual around when I take a gun apart, least I wind up with an extra part or two. Google to the rescue:
Yeah, it's an odd name, but this guy has one heck of a collection of gun manuals. I'm going to have to see if I have anything I can contribute. The rest of the site is rather interesting, too. Start at the top and work down.