The web site below is for the Wooden Canoe Heritage Association. Lots of info about wood and canvas canoes. Also, lots of links to companies that fix them.
http://www.wcha.org/
If you want to do it yourself, there are some books out there, some are listed on the site. I recommend the'The Wood and Canvas Canoe' by Jerry Stelmok and Rolling Thurlow.
Good Luck, John