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

Martin Gardner's Science Magic

Perplexing Puzzles and Tantalizing Teasers

My Best Mathematical and Logic Puzzles

Cele mai indragite jocuri matematice si logice. Matematica recreativa