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Includes letters from Paul Dirac, the Institute of Physics, Laser-Scan Laboratories Limited, R. Lüst, Max-Planck-Gesellschaft, the Royal Society, and Lord Todd.

Fraser, R. 1947, 1963

Freeman, J. 1955

Freudenreich, R.v. 1965, 1973. Letter 1965 is to Lise Meitner, re history of her work in 1930s; letter 1973 is re work of P.A.M. Dirac.

Friesen, I.v. 1948-49

Frisch, D.H. 1963