- 1930-1974 (Production)
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The main sequence of correspondence (J.1 - J.124) is presented alphabetically, dated, and with an indication of any material of particular scientific or biographical interest. Most of the correspondence is with individuals, but some societies and organisations are also included.
There are few very substantial exchanges and it is clear that there are considerable gaps in the material; in particular there is very little early correspondence on electron diffraction, and the only letter in the collection from J.J. Thomson is at C.3.
J.125 - J.134 consists of shorter correspondence, mostly unindexed.