This is the first of a sequence of stiff-backed looseleaf binders (MSS. Eng. d.2135-2194). They begin on 5 May 1954 with the attachment of heavy atoms to type A crystals, and continue to November 1963, covering the X-ray analysis programme at 6-Å, 2-Å, 1.5-Å and 1.4-Å.

Type A heavy atom (Book I). Narratives, observations, calculations, scaling, contour maps, printouts. Includes some work by Bodo.