B. BØGGILD, O. The Iron Ore Resources of the World; an Inquiry made upon the Initative Committee of the XI International Geological Congress. Stockholm 1910. 2 Vols (1068 S. + 22 Tvl) + Atlas (43 Kort). Geografisk Tidsskrift, [S. l.], v. 20, 1910. Disponível em: https://tidsskrift.dk/geografisktidsskrift/article/view/49554. Acesso em: 3 maj. 2024.