TY  - BOOK
AU  - Oracion,Vivencio III
TI  - Math challenges: enhancement exercises for high school math 
SN  - 0119-581-6
U1  - 510 Or1 1999 
PY  - 1999///
CY  - Philippines
PB  - Belgosa Media Systems, Inc.
KW  - Mathematics
ER  -