TY  - BOOK
AU  - Warn,Chris
TI  - The ordnance survey : map skills book / 
SN  - 031900063X
U1  - 526 
PY  - 1980///
CY  - London
PB  - Arnold-Wheaton, 
KW  - Astronomy
KW  - Maps
KW  - Cartography
ER  -