51.
55.
The Think Tank: A Fantastic Collection of 3-D and Pop-Up Games and Puzzles
by Moscovich, Ivan
ISBN: 9780091809034
60.
Puzzle Universe : A History of Mathematics in 315 Puzzles
by Moscovich, Ivan
ISBN: 9780228101536
List Price: $24.95
61.
Marea carte a jocurilor mintii volumul 2 Probleme creative - Ivan Moscovich
by Unknown
ISBN: 9789736756979