TY  - BOOK
AU  - Simpson, Alexander
AU  - Simpson, Alexander
TI  - Navigation guide. Vol. 2, Celestial navigation / by Alexander Simpson
SN  - 851745334
AV  - VK559 . S1 1991 
U1  - VK559 . S1 1991 
PY  - 1991///
PB  - Glasgow : Brown, Son & Ferguson
ER  -