I've found several lists online and on typophile of typography/design books, however a lot of them seem to be picture books with little foundation…
Here's my list of books I consider essential - anyone have any more?
Joseph Muller Brockmann - Grid Systems in Graphic Design
Jan Tschichold - The New Typography
Norman Potter - What is a Designer?
Emil Ruder – Typography
Robert Bringhurst - Elements of Typographic Style
Notable mention to
Willi Kunz – Typography:Formation + Transformation
(Just a stunning book)