This archive, organized around the report, 'Fusion Research in the United Kingdom, 1945-1960,' by J. Hendry and J. D. Lawson, consists of relevant reports, references, and explanatory and historical notes, photographs, clippings, letters, and a bibliography. The collection includes: Box 1: Explanatory notes and a loose-leaf copy of the above mentioned report, interleaved with blank pages for additional notes, including references to material not generally available or lost; Box 2: References; Box 3: References; bibliography, and title pages and abstracts of various reports; Box 4: Published papers and reports, mostly references cited in Lawson and Hendry's paper (but including other historical material as well); Press clippings, 1955, 1957, 1958; Press visit to Zeta; and Photographs filed under four categories: P. C. Thonemann's equipment at Clarendon Lab; People; Zeta (equipment and team); and Miscellaneous; Box 5: 'The Zeta Episode,' report by R. M. Heckstall-Smith, 1975; manuscript notes of J. D. Lawson, 1954-1956; less important papers, 1959-1960; progress reports, historical notes and letters; correspondence concerning early measurements of D-T cross sections; and less important miscellaneous papers.