Postcard to Tinbergen's father, The Hague, 4 August 1932; two family letters from Greenland, 16 August [1932] and ?14 September 1932; letter from T. van Lohuizen to Tinbergen's father, The Hague, 26 August 1932; contents of envelope addressed to Tinbergen's father: letter from the Grønlands Styrelse, Copenhagen, 12 September 1932 and draft reply, 29 October 1932 (both in Danish), and draft letter of thanks for forwarding a letter 'from our children in Greenland' (in English).