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Four letters from N Bohr to Frisch, Princeton, 20 and 24 January and 9 February 1939 (in Danish) and 3 February 1939 (in English).
The letter of 9 February has a half-page note (in German) by L. Rosenfeld.

1949, 1970–74.
Correspondence 1970 includes copy of events at 'Copenhagen Conferences', 1929-37.