TY  - BOOK
AU  - Catolos,Elvira C.et al
TI  - Plane and spherical trigonometry
SN  - 9789718214725
PY  - 2013///
CY  - Malabon City 
PB  - Mutya Pub.
KW  - 1. Trigonometry, Planecal
KW  -   2. Trigonometry, Spherical
ER  -