25694674
9781176478787
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Blackburne, H. s. is the author of 'Tables for Azimuths, Great-Circle Sailing, and Reduction to the Meridian : With a new and improved Sumner method- latitudes 90° N. to 90° S. , Declin', published 2010 under ISBN 9781176478787 and ISBN 1176478788.
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