Postmaster Josef Oskar Kristuman was distrusted by the local police because of his Estonian background and friendship with Japanese residents of Cossack, 1942.
Joseph Oscar Christman acknowledges his appointment as Postmaster at Cossack on 1 March 1939. NAA: PP212/1, O1939/117
The Australian Military Forces Western Command directs that Joseph Oscar Chistman be removed from his position as controller of communications, 19 Feb 1942. NAA: PP212/1, O1939/117
Termination of employment confirmation by the Postmaster-General's Department, 29 Jul 1942. NAA: PP212/1, O1939/117