Type A heavy atom (Book XX). Work on 6-Å 3D Fourier synthesis (continuation of Book XIX, MS. Eng. d. 2153). Index for each topic as follows: "z Fourier projection". Notes, calculations, phase circles, printouts. Some pages dated, March 1956 - June 1957. "3D Fourier synthesis of myoglobin - 6-Å". Tables, calculations and revisions (many by Kendrew), printouts. Includes collaborators' work. Various dates July 1957 - October 1958 and a later note on "Testing of myoglobin…