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Grid Reference Finder | OS Map
Beginner's guide to using grid references | OS GetOutside
Ordnance Survey Grid Reference Tool - GeoPunk
Side by side georeferenced maps viewer - Map Images
GridPoint GB - MacKerron
GENUKI: Salisbury, Wiltshire
GeoDojo: UK Grid Reference Finder
BritishNationalGrid.uk
OS Landranger - Bench Mark Database
Measuring distances and grid references - BBC Bitesize