Contours from Geological Map of Greenbushes Geological Survey No 32. Original topographic survey by HWB Talbot. Geology by R A Hobson. An area south east of Greenbushes Townsite and including all the principal lode workings was mapped by R A Hobson and R S Matheson. Geological boundaries elsewhere were fixed by pacing, topographic features and by air photos. Sept to Oct 1942. Inset locality map showing Greenbushes in relation to Perth and Bunbury.
The map was printed for the Department of Mines Geological Survey of Western Australia and taken from, Bulletin No 102 The Greenbushes Mineral Field compiled by Reginald a Hobson and Robert S Matheson, Geologists. The Bulletin dealt with the geology and mineral resources of the Greenbushes Mineral Field, the principal area in Western Australia from which cassiterite has been produced from the year 1888 up to the present date.
 Reginald Hobson was a geologist with the Geological Survey of Western Australia from 1935 to 1947 and subsequently became the Director of the Kalgoorlie School of Mines until 1966
