Bernal and Hodgkin took the first X-ray photograph of a protein structure—crystalline pepsin. They showed that crystals of pepsin give an X-ray diffaction pattern, beginning protein crystallography. This may also be the beginning of structural molecular biology. The paper is freely available from Nature at this link.

Order of authorship in the original publication: Bawden, Pirie, Bernal, Fankuchen. The authors isolated and crystallized tobacco mosaic virus, finding for the first time that a virus contained nucleic acids, when others claimed that it just contained proteins. They showed that the virus molecules were anisometric and consist of ribonucleoprotein.

(Thanks to Juan Weiss for this reference and its interpretation.)

This pioneering sociological study contained two large folding information graphics. The first was one of the first attempts at a "map of science." It divided science into physical, biological, and social sectors, and distinguished between fundamental and technical research.

An outstanding illustrated synthesis of the topics as they stood in 1967, including Chapter 2: "Notions of the origins of life in the past," summarizing prior theories. Appendix 1 publishes the English translation of Oparin's Proiskhozhedenie Zhizni (No. 7384) followed by Bernal's commentary, as well as Haldane's "The origin of life (No. 7467), followed by Bernal's commentary.