My book is self-published. I did look into getting an ISBN number which is a national registry code to get wider distribution, but felt like that it would become too corporate. This was something I wanted to have 100% say in how it got produced, distributed, etc. To be honest, it's pretty much a local topic and I am not sure that it would do all that well outside of Central Oregon. I have managed to sell around 200 copies which is about 199 more than I imagined I would ever sell, so I think I've done all right with it. The book itself is only about 40 pages long but makes a nice evening read with a beer, glass of wine, whatever.