TY  - BOOK
AU  - Tupas, Sylvino V
AU  - Tupas, Sylvino V
TI  - Workbook in plane and spherical trigonometry for maritime students / Sylvino V. Tupas
SN  - 9710306146
AV  - QA531 .T87 2004 
U1  - QA531 .T87 2004 
PY  - 2004///
PB  - Philippine: Philippine Foundation for Maritime Teaching Aids, 2004.
ER  -