Orange River Colony 1868-1910 by Archibald George Mount Batten, 1972. Revenue Stamps of the Cape of Good Hope, Natal, Orange River Colony, Transvaal and the Union of South Africa by Dodd, 1958. The Stamps of the Orange Free State: Part 1, The Republican Era 1854–1900 by G D Buckley and W B Marriott, 1966. External links Orange Free State Study Circle Cape & Natal Study Circle The Philatelic Society for Greater Southern Africa Stamp Domain Resource Page References Orange Free State Orange Free State