A "page manuscript" refers to a written document that is made up of multiple pages. It usually indicates a book, an article, or any written material that is longer than just a single page. Full definition
The two men spend the film trying to bring a 1000 + page manuscript of Wolfe's novel, «Look Homeward, Angel» down to a manageable length for publishing, and it puts them at odds with just about everyone, including themselves. (rowthree.com)