Ploughing Sundercut and Disc Plough statistics sheets

R. B. Ritchie & Son Pty Ltd, Ploughing Sundercut and Disc Plough statistics sheets (c.1930-1963), [UMA-ITE-1985008300196]. University of Melbourne Archives, accessed 02/04/2026, https://archives.library.unimelb.edu.au/nodes/view/255459