"7-10 August 1959". Work on phase refinement, random sampling using M. Rossmann's program. Calculations, notes, graphs, printouts, corrections and checking. Almost all by Dickerson, a little by Strandberg. This was a particularly critical period of the research programme, when several important aspects were coming to a point and Dickerson (a principal collaborator) was about to return to America. See MSS. Eng. d. 2167-2172 and also correspondence at MS. Eng. c. 2493