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Geological map of Ruakaka survey district / drawn by G.E. Harris ; compiled from data obtained from the Lands and Survey Department and from Admiralty charts 1851, new ed. 1914 ; additional surveys and geology by H.T. Ferrar and W.H. Cropp of the Geological Survey Branch of the Department of Scientific and Industrial Research.
Geological map of Bay of Islands, Russell and Whangaruru survey districts / drawn by G.E. Harris ; compiled from data obtained from the Lands and Survey Department, from Admiralty charts, and from additional surveys by H.T. Ferrar and W.H. Cropp of the Geological Survey Branch of the Mines Department ; geology by H.T. Ferrar and W.H. Cropp.
Geological map of Tangihua survey district / drawn by G.E. Harris ; compiled from data obtained from the Lands and Survey Department and from Admiralty charts ; additional surveys and geology by H.T. Ferrar and W.H. Cropp of the Geological Survey Branch of the Department of Scientific and Industrial Research.