PRM - Council of Ministers (Cabinet Office). 1939 - 1991. PRM Council of Ministers (Cabinet Office). Archive of the Prime Minister 1939 - 1945.
Gen. Sikorski’s correspondence during his trip to the USSR, 1941 PRM – Council of Ministers (Cabinet Office). 1939 – 1991. PRM Council of Ministers (Cabinet Office). Archive of the Prime Minister 1939 – 1945.