Telegram, letter and 'brief-telegram' from Greenland dated 5, 6 and 24 October 1932; letter from Danish captain E. Mikkelsen to Tinbergen's mother, 17 October 1932 (in Danish with Dutch translation) and draft reply dated 30 October 1932 (in Danish); two draft letters from Tinbergen's mother to Scottish trawler captains, 29 October and 11 November 1932 (in English).