John Abner Sfrigge

John Abner Sfrigge

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Stars and Sextants, 1904: Star Distance Tables for Facilitating the Use of Lord Ellenborough's Method of Correcting the Centring and Total Errors of Sextants at Sea (Classic Reprint)NR
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2.
Stars and Sextants, 1904: Star Distance Tables for Facilitating the Use of Lord Ellenborough's Method of Correcting the Centring and Total Errors of Sextants at Sea (Classic Reprint)NR
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