Bound typescript memoir by Duncan entitled 'Camp leader' relating to his experiences in civilian internment camps in occupied Denmark and Germany, 1940-1944, with additional biographical notes by Duncan's son, John Daniel Duncan, Sep 1997.

Bound issues of In Ruhleben Camp , the Ruhleben camp magazine, June 1915 - June 1917; with two issues of La Vie Française de Ruhleben , April 1916 and July 1916. Also The History of Ruhleben: A Record of British Organisation in a Prison Camp in Germany , Joseph Powell (Captain of the Camp) and Francis Gribble (W. Collins, London, 1919).