Nautical chart of Reefs in the south west Pacific Ocean. Middleton Reef surveyed by Captain H.M. Denham assisted by the officers of H.M.S Herald, 1853. Elizabeth Reef surveyed by Lieutenant G.E. Richards assisted by Sub-Lieut Tippings, H.M.S. Renard 1878. Not current - not to be used for navigation!
<bdi><a href="https://en.wikipedia.org/wiki/en:United_Kingdom_Hydrographic_Office" class="extiw" title="w:en:United Kingdom Hydrographic Office"><span title="UK government agency concerned with providing hydrographic and marine geospatial data">United Kingdom Hydrographic Office</span></a>
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Scan of original Admiralty Chart