VAHL, M. William Herbert Hobbs: Exploring About the North Pole of the Winds (16x23 cm, 376 Sider, talrige Afb.) G. P. Putnam Sons, New York 1930. Geografisk Tidsskrift - Danish Journal of Geography, [S. l.], v. 33, 1930. Disponível em: https://tidsskrift.dk/geografisktidsskrift/article/view/47798. Acesso em: 19 oct. 2024.