Contain duplicated and manuscript material of various dates, 1951-1952, with some manuscript pages of calculations inserted or loose, dealing with assembly, input, floatcode and other routines, preparatory to revision of handbook.

The duplicated pages bear many manuscript comments, corrections, etc. by Strachey.

Note: Also contains a useful note contributed, 1978, by M. Campbell-Kelly on the likely attribution of various routines to A.M. Turing, C. Popplewell, A. Glennie, R.A. Brooker and Strachey.