Four South Australian Parliamentary Papers from June to August 1870 comprising a gripping narrative of the Overland Telegraph, from No. 36 John McKinlays 'Offer to Survey Route for Telegraph line to Port Darwin', through competing plans, No. 24 and 24A 'British-Australian Telegraph' with folding map, to Charles Todds successful outcome, the list of 'Officers on Overland Telegraph Staff' No 97