TY  - BOOK
AU  - Ynion, Eugenio J.
TI  - Terrestrial navigation 2
SN  - 9710306065
U1  - 623.89 
PY  - 2003///
CY  - Makati City
PB  - Philippine Foundation for Maritime Teaching Aids
KW  - Navigation
N1  - Includes bibliographical references (page 115)
ER  -