Image: Percy Sladen Trust expedition 1905 magnetic variation transactionsofli214linn 0024
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Description: Chart of curves of equal magnetic variation in the Indian Ocean, from the Percy Sladen Trust expedition in 1905.
Title: Percy Sladen Trust expedition 1905 magnetic variation transactionsofli214linn 0024
Credit: https://archive.org/details/transactionsofli214linn/page/10
Author: Author of article: Boyle T. Somerville (1863-1936)
Usage Terms: Public domain
License: Public domain
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