Joe Cameron, "IQ Challenge: Over 500 Perplexing Number, Letter & Visual Puzzles by Joe Cameron " English | ISBN: 0760779279 | 2006 | 208 pages | PDF | 11 MB
IQ MINDBENDERS: A Fantastic Collection of Over 500 Mind-Bending Puzzles by Joe Cameron English | 30 Jun. 2001 | ISBN: 1402709641, 076073433X | 208 Pages | PDF | 13.1 MB