46841385
9781371684372
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Blackburne, Harold S. is the author of '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', published 2016 under ISBN 9781371684372 and ISBN 1371684375.
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