United East India Company: manuscript map, 'This survey of Gaspar & Clement's Straits is respectfully dedicated to the Honorable the court of Directors for the Affairs of the United East India Company by their obedient servant D. Ross Commander in the H.C. Marine, 1818, drawn by M. Houghton, I was assisted in this survey by Lieut't P. Maughan, assistant Surveyor, and by Lieut't J. Crawford commanding the Investigator. D.R.', 91 x 61 cm overall