Rubber Companies Bikam Rubber Estate Ltd Eastern Sumatra Rubber

R. B. Ritchie & Son Pty Ltd, Rubber Companies Bikam Rubber Estate Ltd Eastern Sumatra Rubber (19 August 1939-31 December 1939), [UMA-ITE-1985008300403]. University of Melbourne Archives, accessed 20/03/2026, https://archives.library.unimelb.edu.au/nodes/view/255666