Codes, Ciphers and Secret Writing

Calculus Made Easy

Threatened Plants of Central and South Chile

Cele mai indragite jocuri matematice si logice. Matematica recreativa - Martin Gardner

Bar Bets to Win Big Bucks. Money-Making Tricks and Brainteasers, Paperback

Entertaining Mathematical Puzzles

Mathematics, Magic and Mystery

Martin Gardner's Science Magic

Perplexing Puzzles and Tantalizing Teasers

My Best Mathematical and Logic Puzzles