Cambridge Digital Library

• Keyword: Hecla

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1. ▸  Collection
   • Royal Commonwealth Society (2)
   • Royal Greenwich Observatory Archives (29)
2. ▸  Subject
   • Marine navigation (20)
   • Time Measuring Instruments (11)
   • Astronomy (7)
   • ASTRONOMY (6)
   • Longitude (6)
   • Geographical exploration (5)
   • Meteorology (5)
   • Navigational aids (4)
   • Astronomical observatories (2)
   • Astronomical Observatories (1)
   • Legislation (1)
   • NATURAL SCIENCES (1)
   • Natural history (1)
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   • Temperature (1)
3. ▸  Place
4. ▸  Languages
   • English (2)
5. ▸  Date
   • 1600s C.E. (1)
   • 1700s C.E. (5)
   • 1800s C.E. (29)
   • 1900s C.E. (2)