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Principal triangulation of great britain

First trigonometric survey of Britain

Pronunciation
/ˈprɪnsɪpəl trʌɪaŋɡjʊˈleɪʃn əv ɡreɪt ˈbrɪtən/
/ˈprɪnsəpəl ˌtraɪˌæŋɡjəˈleɪʃən əv ɡreɪt ˈbrɪtn/