TY  - BOOK
AU  - Birtwistle,Claude
TI  - The calculator puzzle book
SN  - 0517266822
AV  - QA75 .B55
U1  - 793.7/4 
PY  - 1978///
CY  - New York
PB  - Bell Pub. Co.
KW  - Calculators
KW  - Problems, exercises, etc
KW  - Mathematical recreations
N1  - Includes index
UR  - http://www.archive.org/details/calculatorpuzzle00birt
UR  - http://www.openlibrary.org/books/OL4735743M
ER  -