Rivet Wars is show a flip-through of their upcoming art book they’re working on.
From the preview:
I’ve been putting a lot of work into the Rivet Wars: Art Book. I really want everyone to get a nice art book that you can add to your collection. So I printed this black and white copy of the book to get a sense of things and its looking really good. This is just a flip through of it so that you all could get a feel for the content. The final will be color.