Charles H. Goren's 100 Challenging Bridge Hands for You to Enjoy: Test Your Skill Against the Master's Winning Way to Play and Defend

One word of warning - the bidding is obsolete, so some inferences/hand shapes are hard to determine There are 50 declarer and 50 defense problems. They are tricky, but not very hard, like some of Hugh Kelseys problems. The emphasis is on visualization, not squeeze play. You need to think ahead and look at pitfalls. Since the books is very inexpensive, and you get 100 problems, and the hands are generally pretty good, its great value for the money. A solid intermediate level book.