A new app can help you sell your books online at Amazon, but it’s more complicated than you might think.

The app, called B.A.S.E. (buy books online with Amazon) offers a free textbook download service.

You can choose from a number of titles, including:1.

The Book of Common Sense by Charles Stross, a history of science and technology.2.

The Best-Selling Book by Michael W. Ditka, a biography of the late NFL coach.3.

The Greatest Story Ever Told by Tom Hanks, a novel about a college football coach and a high school football coach.4.

How to Sell Your Books Online with Amazon.