All the Provisioner books through level 49 (except a few quested oddities) are available from the Crafting Trainers. However, they will only show you the books for the tier you are in and below; you won't be able to see level 30-39 books until you're 30.
Here's a handy guide to books: http://eq2.eqtraders.com/articles/article_page.php?article=g53&menustr=040000000000