1 - The book of numbers
Conway, John Horton (1937-....)   /   Guy, Richard K. (1916-....)

Cote : [30 CON 96]

2 - Unsolved problems in geometry
Croft, Hallard T.   /   Falconer, Kenneth J. (1952-....)   /   Guy, Richard K. (1916-....)

Cote : [60 CRO 91]

3 - Unsolved problems in number theory. Volume 1 : Unsolved problems in intuitive mathematics
Guy, Richard K. (1916-....)

Cote : [02.3 GUY 81]