TY  - BOOK
AU  - Harley,J.B.(John Brian).
TI  - Ordnance Survey maps: a descriptive manual 
PY  - 1975///
CY  - Ordnance Survey
PB  - Southampton
KW  - Great Britain. Ordnance Survey
KW  - Cartography
KW  - Great Britain
KW  - Maps, Topographic
N1  - Includes index; Bibliography: p. 185-191
ER  -