Offhand I can think of a few that I've read at least 2-3 times. And in a couple of cases, maybe as many as 4 or 5 times. There are probably some others that just aren't jumping to mind, but suffice it to say that these are all books I've found very valuable. The Four Steps to the Epiphany - Steve Blank The Discipline of Market Leaders - Michael Treacy and Fred Wiersema Society of Mind - Marvin Minsky Mastering the Complex Sale - Jeff Thull How to Measure Anything - Douglas Hubbard The Selfish Gene - Richard Dawkins
Also recommended in this reply