Veteran explorer C. E. Douglas (left) was joined by A. P. Harper in charting remote parts of the West Coast for the Department of Lands and Survey from 1893. They and dog Betsey Jane rest briefly in the Cook River Valley in 1894.
Graham Langton. 'Douglas, Charles Edward', Dictionary of New Zealand Biography, first published in 1993, updated November, 2007. Te Ara - the Encyclopedia of New Zealand, https://teara.govt.nz/mi/biographies/2d16/douglas-charles-edward (accessed 30 September 2020)