Odd Combination

There is an out-of-stock listing for the memoirs of Gonzalo Santos (a book I have sought, without success, for years, in case anyone can point me to a copy for sale) at ecampus.com, which says that the autobiography of the San Luis Potosí caudillo is frequently purchased by readers of John Grisham's Ford County, The Smart Girl's Guide to Porn, and Biology with MasteringBiology. If you were asked to name the four books with the least number of common threads, you'd have a hard time beating these four.