Thirty years before Columbus

My books tend to have Amazon sales ranks that resemble the zip codes of places somewhere between the Carolinas and Indiana. This doesn't mean the books don't sell well. They just tend to sell at a steady rate without any surges, while the Amazon system is highly weighted toward the moment. However, for the last week or two, Sleeping Freshmen Never Lie has stayed pretty much below 4,000 in sales rank with dips as low as 1,462 (I just checked). While I can rarely explain these things (it's ...