Dual, ‘a native of Appin’, accompanies explorer Hamilton Hume on an expedition from Appin to bush country in the area of today’s Berrima and Bong Bong, New South Wales. Source: Rev. W. Ross of Goulburn, Preface to Hamilton Hume, A Brief Statement of Facts, 2nd edition, Yass, 1872:18; J. P. McGuane, Centenary of Campbelltown, handwritten account, 1920, Mitchell Library, Sydney. www.k6.boardofstudies.nsw.edu.au/files/hsie/back09b.pdf