TY  - BOOK
AU  - Coolen, Edward J. 
ED  - Brown Son & Ferguson. 
TI  - Nicholls's concise guide to navigation volume 1 / 
SN  - 9780851745398 
U1  - 623.89 23
PY  - 1987///.
CY  - Glasgow : 
PB  - Brown Son & Ferguson, 
KW  - Navigation.
KW  - Nautical astronomy.
KW  - Nautical charts.
ER  -