Cambridge Digital Library

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1. ▸  Collection
   • Christian Works (1)
   • Darwin Manuscripts (4)
   • Royal Greenwich Observatory Archives (14)
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2. ▸  Subject
   • Longitude (14)
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   • Astronomy (13)
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3. ▸  Page has transcription
   • No (20)
4. ▸  Languages
   • Latin (1)
5. ▸  Date
   • 1100s C.E. (1)
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   • 1400s C.E. (1)
   • 1800s C.E. (18)