TY  - BOOK
AU  - O'Daffer
TI  - Preálgebra / 
U1  - 512 O313 
PY  - 1992///
CY  - Wilmington : 
PB  - Addison - Wesley, 
KW  - ALGEBRA
KW  - Charles, Randall
KW  - Clemens, Stanley
ER  -