Inventors And Their Inventions Class Set Of 29 Time For Kids Books, Plus Teaching Materials.... Condition is Very Good. These materials are perfect to use with a unit on inventors. I taught a unit on Thomad Edison and these were used to supplement the lessons. There are 29 TFK books, 10 Klutz scholastic booklets, some weekly reader and TFK magazines, and a couple of picture books. The activity pages go with the theme. I used these with third graders. Shipped with USPS Media Mail.