Alfred Phillipps Ryder, H. W. Bates, Admiral Ryder's Amended Proposal Respecting Prize Medals to Naval Officers and Others in Encouragement of Surveys, and Suggestion of an International Congress of Hydrographers, Proceedings of the Royal Geographical Society and Monthly Record of Geography, Vol. 3, No. 2 (Feb., 1881), pp. 106-108
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Ryder et al. (1881) studied this question.
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