TY  - BOOK
AU  - Studebaker, Gordon
TI  - Add or subtract: computational skills C 
SN  - 0-590-30172-1
AV  - TR 372.7 C652 1980
PY  - 1980///
CY  - New York
PB  - Scholastic
KW  - Mathematics
KW  - Subtraction
KW  - Add
ER  -