TY  - BOOK
AU  - Fabra, Norberto F. 
TI  - Trigonometry for secondary schools
U1  - FIL 516.24 F11t 1985  
PY  - 1985///
CY  - Manila
PB  - Fabra, N.F. Educational Books, 
KW  - Trigonometry
ER  -