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Radcliffe Tracts 53 (2)Riddell, C. J. B.
Magnetical Instructions for the Use of Portable Instruments adapted for Magnetical Surveys and Portable Observatories, and for the Use of a Set of Small Instruments Adapted from a fixed Magnetical Observatory; with Forms for the Registry of Magnetical and Meteorological Observations
Printed by Order of the Lords Commissioner of the Admiralty, 1844.
[1934-41]
1844