This collection is very extensive, covering most aspects of Bullard's varied career. Includes biographical and personal material, diaries, personal and family correspondence, photographs, records of the Cambridge Dept. of Geodesy and Geophysics including the original correspondence leading up to its foundation in 1921, and documentation of his connection with the University of California, chiefly the Scripps Institution of Oceanography. The largest body of material relates to Bullard's many research interests from early work on gravity to the last uncompleted book on energy sources and nuclear waste disposal, and includes full documentation for his work on dynamo theory and on computing applications. There is much material on Bullard's service on committees and as consultant, relating to learned societies and professional organizations, to publications, lectures and broadcasts, and to visits and conferences. Bullard's surviving scientific correspondence is somewhat disappointing and contains a high proportion of material dating from his later years. Missing are his wartime papers which he destroyed in 1945 and his official papers at Toronto and the National Physical Laboratory.