| Description | These include the period of the confrontation on bombing policy involving Tizard, Blackett and Cherwell (see Lovell,  'P.M.S. Blackett: A Biographical Memoir', Royal Society: 1976, pp64065) and also material preceding and following it.  Blackett worked over these papers on more than one occasion after the events; in particular he made considerable efforts in 1962 to locate certain missing reports (see D.76-78 for correspondence on this subject), but it is clear that the remaining material is still incomplete. 
 See under Tizard in the Index of correspondents for other material on these matters.
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