SECTION A BIOGRAPHICAL & PERSONAL A. 1-A.62
SECTION B SWITZERLAND B. 1-B.8
SECTION C CAMBRIDGE C. 1-C.18
SECTION D "TUBE ALLOYS" D. 1-D.105
SECTION E LOS ALAMOS E. 1-E.29
SECTION F ATOMIC ENERGY RESEARCH ESTABLISHMENT, HARWELL F. 1-F.180
SECTION G VISITS G. 1-G.14
SECTION H CORRESPONDENCE H. 1-H.80
The collection, though not exhaustive, includes some useful material on Bretscher's career and some of the momentous events in which he participated. Of interest in Section A (Biographical and Personal) are A.5 Bretscher's own 'Survey of activities during the war and with the A.E.R.E.', compiled in 1964 and A.6, a lecture given at Harwell in 1967 on 'Wartime nuclear physics and chemical research at the Cavendish Laboratory 1940-44 associated with atomic weapons'.
Section C (Cambridge) contains a little material on the early stages of Bretscher's atomic research (C.2-C.4) and his collaboration with D.E. Lea (C.5); the notes of a 'Private Colloquium with Fermi' (C.6) are of interest but probably belong to a later period.
Section D documents in considerable detail the work undertaken at the Cavendish Laboratory for the "Tube Alloys" project and includes contemporary research notes and reports by members of the team, reports prepared for the Maud Committee and the Department of Scientific and Industrial Research, and later work relating to postwar publication of the wartime research. Bretscher's regular exchanges of correspondence with Chadwick are also included here.
Section E (Los Alamos) includes some research reports and Bretscher's account of his activities (E.10) as well as various contemporary bulletins and newsletters.
Section F (A.E.R.E. Harwell) is the fullest in the collection and is of interest in documenting Bretscher's involvement in national and international nuclear data committees, and his interest in maintaining collaboration with universities and research institutions.
There is a short Section G (Visits) which includes several visits to Russia and related background reports; the surviving correspondence is to be found in Section H.