What I consider the book that can be read without any need of a chessboard is the classic "Logical chess move by move" by Irving Chernev. I's a book designed for players in the 1400-1800 OTB range, so I think it definitely will suit you. Moreover, this book teaches both conceptual and strategical ideas via move by move analysis of full games, so it is an entertaining and profitable read.
On books about tactics, which can be definitely read without a chessboard in front of you, I recommend "Chess Training Pocket Book" by Lev Alburt. This book presents 300 of the (arguably, but not much) most important positions in chess. They all feature some must-known concept or tactic and are analyzed deeply in a few lines. This book is well suited for players around 1700-2100. The book presents the problems on the left page and the answers to them on the right page, so you don't have to swing back and forth the book, and can be used for training at virtually every place you may open a book. It is extremely useful.