TY  - BOOK
AU  - Yanson, Ernesto A.
TI  - Plane and spherical trigonometry
AV  - QA 531 .P693 2002 
PY  - 0000///[date of publication not identified]
CY  - Manila
PB  - Sta. Monica Publishing
KW  - Plane trigonometry
KW  - Spherical trigonometry
ER  -