102 Combinatorial Problems: From the Training of the USA IMO Team

103 Trigonometry Problems: From the Training of the USA IMO Team

Mathematical Olympiad Challenges

Number Theory: Structures, Examples, and Problems

Putnam and Beyond

Putnam and Beyond: Edition 2

Mathematical Olympiad Challenges: Edition 2

Complex Numbers from A to ...Z

A Path to Combinatorics for Undergraduates: Counting Strategies

Complex Numbers from A to ... Z: Edition 2

Mathematical Olympiad Treasures: Edition 2

Mathematical Bridges

Geometric Problems on Maxima and Minima

An Introduction to Diophantine Equations: A Problem-Based Approach

Problems in Real Analysis: Advanced Calculus on the Real Axis

Awesome Math: Teaching Mathematics with Problem Based Learning

Awesome Math: Teaching Mathematics with Problem Based Learning

104 Number Theory Problems: From the Training of the USA IMO Team