B. Bøggild, O. (1922) “Henry B. Sullivan: A catalogue of geological maps of South America. American Geographical Society. Research Series No. 9. New York 1922”., Geografisk Tidsskrift, 26. Tilgængelig hos: https://tidsskrift.dk/geografisktidsskrift/article/view/47199 (Set: 25 december 2025).