TY  - BOOK
AU  - Allen, Robert
TI  - The Ultimate Mental Challenge: Over 500 different puzzles to give your brain the ultimate workout
SN  - 1858681162
AV  - RC 469 .A33 1995
PY  - 1995///
CY  - Calton
PB  - Mensa Publications
KW  - Mental Challenge
ER  -