TY  - BOOK
AU  - Ynion, Eugenio J.
AU  - Flores, Irvin S.
TI  - Terrestrial navigation 1
SN  - 9719237538
U1  - 623.89 
PY  - 2001///
CY  - Makati City
PB  - Philippine Foundation for Maritime Teaching Aids
KW  - Navigation
N1  - Includes bibliographical references (page 143)
ER  -