That book has appeared in a few premium bookstores - Try looking in Borders Books & Music shops.
Having never read it, I should not say this: but designing a textbook on how to solve problems seems to be too vague as a task or set of tasks for which to write a book. You learn to solve problems through at least a few years of study and subject matter design; including at times collaboration with other problem solvers and problem posers. I believe that fundamental mechanics physics forces some people to become problem solvers. We just learn to think more critically, but specifically what else is happening in our development may not be so clear...