"Actual Photographs Taken by the Andrée Expedition and Now Developed after 33 Years in Arctic Ice." Illustrated London News, 29 Nov. 1930, p. 974-975. The Illustrated London News Historical Archive, 1842-2003, https://link.gale.com/apps/doc/HN3100287944/GDCS?u=webdemo&sid=bookmark-GDCS&xid=ff9d9e3b