B. BØGGILD, O. World Atlas of commercial Geology. Part 11. . Water Power of the World. United States Geological Survey, Washington, 1921. Geografisk Tidsskrift, [S. l.], v. 26, 1922. Disponível em: https://tidsskrift.dk/geografisktidsskrift/article/view/47187. Acesso em: 18 jul. 2024.