Yesterday I visited a bookstore in Detroit that I have been frequenting for 30 years. My intention was to purchase a book I saw there a few months ago about Booths oil speculations in Pennsylvania. I wanted to purchase it then but for some reason I didn't. Of course, yesterday I found it was gone. Rule of thumb: when you think you should probably buy a book that you are inclined to buy- because if you don't- you will probably regret later that you didn't!