TY  - BOOK
AU  - Ynion, Eugenio J.
TI  - Terrestrial navigation 2 / 
SN  - 9710306065
AV  - FIL VK 555 Y55 2003
PY  - 2003///
CY  - Pasig City
PB  - Philippine Foundation for Maritime Teaching Aids, Inc. and the Author
ER  -