TY  - BOOK
AU  - Hellman,Hal, x
AU  - x
TI  - Navigation; land, sea and sky: x
SN  - x
U1  - J623.8/HEN 
PY  - 1966///
CY  - Englewood Cliffs
PB  - Prentice-Hall
KW  - Navigation
N1  - x
ER  -