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There's actually tons of them. Gurney's "Imaginitive Realism" is all about concept art and the illustration process. Sketching and Sketching: The Basics are good for concept art. ANY books on marker rendering - Dick Powell's "Design Rendering Techniques" being the best. Doug Chiang's book Mechanika. ANY book on industrial design. Many of the top names in concept art are industrial designers. Keith Thompson's books on vehicles and robots are good. Most of Impact publishing's books are good for concept art. Freaks by Steve Miller is decent. Barron's publishing has many excellent books related to concept art. How to Draw Cars the Hot Wheels Way is outstanding - along with How to Draw Cars Like A Pro. Rob Alexander has a great book on How to Draw and Paint Fantasy Landscapes and Cityscapes.
There is no shortage of excellent books and resources out there...just a shortage of people willing to do what it takes who want easy, fast food answers and solutions.
Edit: I just want to add that every decent book ever written about drawing covers concept art.
Yep, there's plenty of books, but it helps to broaden your search beyond the term "concept art", as a lot of the good info is in books that aren't exactly touted as "concept art" books... (Like Gurney's books, or the industrial design books Jeff just mentioned.)
Lots of books geared specifically to drawing comics or storyboarding will have valuable info for concept artists as well, especially about composition and storytelling, and perspective and constructive anatomy.