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Position finding by the improved "Sumner" method : contrasted with the new navigation (Marcq St. Hilaire System), and the old "Sumner" method ; together with a few special star reduction and azimuth tables /

Title:Position finding by the improved "Sumner" method : contrasted with the new navigation (Marcq St. Hilaire System), and the old "Sumner" method ; together with a few special star reduction and azimuth tables /
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Note:Wellington, N.Z. : John Mackay, 1914
  
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Subject:Sumner method
Subject:Navigation
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