TY  - BOOK
AU  - Denne,W.
AU  - Cockcroft,A.N.
TI  - Magnetic compass deviation and correction : : a manual of the theory of the deviations and mechanical correction of magnetic compasses in ships / 
SN  - 0851743323
U1  - 623.892 23
PY  - 1979///.
CY  - Glasgow : 
PB  - Brown and Ferguson, 
KW  - Magnetic declination.
N1  - Includes index
ER  -