TY  - BOOK
AU  - Oracion,Vivencio III
AU  - Magno-Pavia,MaMargarita T.
TI  - Math challenges vol. 3: sophomore 
SN  - 971-48-0153-2
U1  - Fil./Ref. 510.76 Or1 1999 
PY  - 1999///
CY  - Philippines
PB  - Diwa Scholastic Press Inc.
KW  - Mathematics - Review and exercises
ER  -