10 Reports that can be resold.

...anything that is NOT protected under US copyright law. This includes ALL works published before 1923 AND, under certain conditions, works published up to 1978. A 'work' can be anything: a book, a play, music, photographs, movies, instruction manuals, courses, reports, posters, etc...

Re-publishing and re-packaging public domain information and other creative works can make you a lot of money. The reason is fairly simple: If you find, re-package and sell information that has fallen into the public domain you do not have to pay royalties or copyright fees on that work.
Knowledge is power and power equals money honey. Great deal.