The Booksearch app is an awesome little app that allows you to search for books based title or author, just like a card catalog, but what makes it different is that it also allows you to search by the skill you are teaching. I know what you are thinking... "Big deal, you can use ANY book, to teach ANY skill". Well, yeah, you can, but this is sort of like pushing an easy button. It gives you a list of books (most of them are books you probably already own or are in your school or public library) and skills you could teach from them. It also has connections to other books with similar skills or themes. It's meant to save you time.
So here's a little video to show you how it works.