Kalckar, Fritz, 1910-1938.
Fritz Kalckar papers, 1930s.
Miscellaneous papers and letters. Letters home to his family written when Fritz Kalckar was on a journey to the USA with Niels Bohr, February to June, 1937.
Danish physicist. Assistant to Niels Bohr.
Bohr, Niels, 1885-1962
United States -- Travel -- 1930s.
Physicists. lcsh
AIP-ICOS
Niels Bohr Archive. Blegdamsvej 17, Copenhagen, Denmark