- Digital Commonwealth
- Atwood House Museum of the Chatham Historical Society
Title from item. Date supplied by cataloger. Surveyed by Lieutenants T.M. Symonds and H.R. Henry of H.M.S. Rattlesnake, 1836, with a subsequent survey of the entrance channel by Commander I.C. Wickham in H.M.S. Beagle, 1842.
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