Good Books on Mathematics

Look at "Five Equations That Changed The World", by Guillen comes to mind. Also, "Longitude" by Sobel.Harper Collins Dictionary of MathematicsW.W. Sawyer: What is Calculus About? and Mathematician's DelightCourant and Robbins: What is Mathematics?Hogben: Mathematics for the MillionSteinhaus: Mathematical SnapshotsIvars Peterson: The Mathematical TouristDavis and Hersh: The Mathematical