Inset showing Greenbushes Town Site and sections through Police Shaft and Shaft X.
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
