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 90⁰ N. to 90⁰ S.
"Also other useful navigational tables, with numerous examples of double altitudes, equal altitudes, azimuths, etc." "Published by direction of the Hon. the Minister of Marine."
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