8761422
9781141799169
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Blackburne, Harold S. is the author of 'Tables for Azimuths, Great-Circle Sailing, and Reduction to the Meridian, with a New and Improved "Sumner" Method: Latitudes 900 N. to 900 S., Declinations ... with Numerous Examples of Double Altitudes', published 2010 under ISBN 9781141799169 and ISBN 1141799162.
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