Seeking old dictionaries, encyclopedias and textbooks

Hi, I am a teen (YA) librarian in Texas. I am planning an altered book craft during our Summer Reading Program. I am seeking 8 to 12 large old books such as dictionaries, encyclopedias or textbooks. If the books are worn and in rough shape, that is fine, even preferable. I desire these old books because of their sewn bindings (not glued) and pages with high cotton content. Some people don't know what to do with these old books that no one else wants. My solution for you is that our teens will turn them into works of art. If you are unfamiliar with altered books, I am using http://gomakesomething.com/ht/thebasics/altered-book/ for guidance. I will pay book rate shipping.