Cambridge Digital Library

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1. ▾ Collection
   • Longitude Essays (5)
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   • Papers of John Pond (19)
   • Papers of Nevil Maskelyne (9)
   • Papers of the Board of Longitude (38)
   • Royal Greenwich Observatory Archives (77)
2. ▾ Subject
   • Time Measuring Instruments (49)
   • Longitude (35)
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3. ▾ Date
   • 1600s C.E. (2)
   • 1700s C.E. (56)
   • 1800s C.E. (32)