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Primordial levelling

Primordial levelling

Levelling network in the Kingdom of Prussia (1868-1918)

en-GB/pɹaɪˈmɔːdɪəl lɛvlɪŋ/

en-US/pɹaɪˈmɑɹdiæl leɪˈveɪlɪŋ/

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precision levelling geodetic control network