TY  - BOOK
AU  - Blewitt, Mary
AU  - 
TI  - Navigation for yachtsmen
U1  - 527:629.125.12 
PY  - 0000///
CY  - London
PB  - 
KW  - navigation for yachtsmen
KW  - Navigation
KW  - Nautical astronomy
KW  - Aeronautical astronomy
ER  -