| Raper, P.E.; Boucher, M., 1988. Robert Jacob Gordon: Cape Travels, 1777 to 1786. Johannesburg, Brenthurst Press (second series vol. 4)., vol. 1, pp. 1-225, vol. 2, pp. 226-462
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| Raper, P.E.; Boucher, M., 1988. Robert Jacob Gordon: Cape Travels, 1777 to 1786. Johannesburg, Brenthurst Press (second series vol. 4)., vol. 1, pp. 1-225, vol. 2, pp. 226-462
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