If you plan to release numerous editions of your book, or print and digital formats, then you need to have a separate ISBN for each. (midnightpublishingllc.com)
Seriously, there's nothing I hate more than if someone would buy (or like) a shirt only because there's only 200 of them (and thus feel offended by a more numerous edition)! (gapingvoid.com)
As a publication, Atlas has gone through numerous editions, each new volume expanding on the previous with elaborations of persistent themes. (artbook.com)