TY  - BOOK
AU  - Pettofrezzo,Anthony J.
AU  - Armstrong,Lee H.
TI  - Arithmetic, a programmed approach
SN  - 0673153142 
AV  - QA107 PET
PY  - 1982///
CY  - Dalas
PB  - Scott, Foresman
KW  - Arithmetic
KW  - Programmed instruction
N1  - Includes bibliographic references and index
ER  -