The longest Etruscan inscription is in Zagreb, Croatia--the Zagreb mummy wrapping, or liber linteus, more than 1000 words long. They have in a special climate-controlled room.
I’m a little surprised we don’t have a topic on it, I was actually sure we did — perhaps it was in one of those “old school” topics that eventually got purged ten years ago, after having been disabled for comments a little while before I started posting here. Its discovery is a good reason to use a non-invasive scanning technology on all known mummies.
http://www.freerepublic.com/tag/liberlinteus/index