Anthony S. Filipiak - Mathematical Puzzles: And Other Brain Twisters
Random House Value Publishing | 1978 | ISBN: 0517015447 | English | 130 pages | DjVu | 1.04 MB
100 puzzles, how to make and how to solve them. Mechanical puzzles of all sorts, mostly mathematical or geometrical variety, with step-by-step instructions for making and solving.