What Is Mathematics': An Elementary Approach to Ideas and Methods, Paperback
Richard Courant
National Geographic Field Guide to the Birds of Eastern North America, Paperback/Jon L. Dunn
Jon L. Dunn
Reverse Mathematics: Proofs from the Inside Out, Hardcover
John Stillwell
Elementary Mathematics from an Advanced Standpoint: Arithmetic, Algebra, Analysis, Paperback
Felix Klein
Undecidable Theories: Studies in Logic and the Foundation of Mathematics, Paperback
Alfred Tarski
Set Theory and the Continuum Problem, Paperback
Raymond M. Smullyan