Courant: What Is Mathematics? An Elementary Approach to Ideas and Methods, by Richard Courant, Herbert Robbins; fundamental concepts and methods of mathematics

Boyer: A History of Mathematics, by Carl B. Boyer, Isaac Asimov

Eves: Foundations and Fundamental Concepts of Mathematics, by Howard Eves; undergraduate text covering the history and evolution of mathematics

Pickover: The Math Book; From Pythagoras to the 57th Dimension, 250 Milestones in the History of Mathematics, by Clifford A. Pickove