Extensive manuscript working papers, plans, diagrams and drafts, including comments by colleagues.

Folder labelled 'Scientific American. Spare copies'. Manuscript drafts and revisions (not spare copies).

Extensively revised proofs and diagrams.

Copy of Scientific American, 215, with article as published. Later correspondence regarding the inclusion of the article in Scientific American Reader on Computers and Computation. Strachey described this as 'a popular article ... it describes, amongst other things, a draughts-playing program'. Strachey found difficulty in writing, and in adequately illustrating, the article, of which many drafts, revisions and…