TY  - BOOK
AU  - Gruber, Gary R.
TI  - World`s 200 hardest  brain teasers: Mind boggling puzzles, problems, and curious questions to sharpen your brain
SN  - 978-1-4022-3857-4
U1  - 793.73  G921B 
CY  - Naperville
PB  - Sourcebooks
ER  -