Cambridge Digital Library

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1. ▾ Collection
   • Longitude Essays (2)
   • Papers of the Board of Longitude (3)
   • Royal Greenwich Observatory Archives (5)
2. ▾ Subject
   • Astronomy (4)
   • Latitude (1)
   • Nautical instruments (1)
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3. ▾ Date
   • 1600s C.E. (1)
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