English version

Ordnance Survey, the

From Longman Dictionary of Contemporary EnglishOrdnance Survey, thethe Ordnance SurveyˌOrdnance ˈSurvey, the (abbrev. OS)  an official organization which makes very detailed and correct maps of Britain and Ireland. The maps are used by people walking in the country, and each map has its own OS number. compare US Geological Survey
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