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Backstaff
Backstaff
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using a sextant
Sailing
The Astrolabe: How to Make One and Understanding Its Use
At Home School House
Les agrimensores
Ancient Technology
quadrant
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Navigation - Backstaff
Geografia
Objekt des Monats, Juli 2008
Navigation
Survivel
Math
Novum Instrumentum Geometricum (1607)
18th Century Mapping
Celestial Navigation Math
Purjehdus
Measuring Instruments
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