This date is also the only day for which substantial text from the journal of a Dutch member of the expedition has been published. C.C.F.M. le Roux included within his later book De Bergpapoua’s van Nieuw Guinea en hun woongebied (Le Roux 1948, vol. 1, p. 94-95) “a few passages regarding our trek into the little settlement of Tombe, among the Dem tribe,” quoting his own field journal about this contact.