So my book "Insha Imperium", Poetry in English and Ukrainian languages is available on the blockchain)
Authorship launched a beta-version of their book platform (ICO was conducted last year) and I decided to test it by uploading my poetry book (which I have also in print is case somebody is interested).
If you are interested in poetry, of if you want to test this book platform - you are welcome to buy this buy with Authorship tokens)
https://beta.authorship.com/media.details.php?mediaID=120
On Steemit there are many writers, many people who published books, so this might become on of the places to market your books. I will update you on this, as it's too early to judge.
It's only beta version and there are not so many books there right now.