Haarhoff, J (2015) Construction of the Prieska-Kalkfontein line 1914-15, Part 2: A major obstacle - the Orange River at Upington. SAICE Magazine May 2015 pp31-40. Adicionar à área de transferência Parte de THL Document Collection
Haarhoff, J & James, W (2014) The Bridge on the River Kraai. SAICE Magazine May 2014 pp41-48. Adicionar à área de transferência Parte de THL Document Collection