Olufsen, Ole. “The Literary Dig-Est Liberty Map of New Europe. Revealing- the Great Changes Broug-Ht about by the World War 1914—19 With Complete Index. Funk J. Wag-Nails, Publishers. New York. 1:4,560,000”. Geografisk Tidsskrift - Danish Journal of Geography 25 (January 1, 1920). Accessed December 5, 2025. https://tidsskrift.dk/geografisktidsskrift/article/view/47099.