Includes narrative reports, correspondence, memoranda, graphs, charts, and photographs relating to contracted work performed by Atomics International, Northrop, General Dynamics, and other contractors for the Energy Research and Development Administration. Of particular interest are items related to the Pluto ram-jet project that concerned the development of nuclear-powered aircraft and SNAP (Subsystems for Nuclear Auxiliary Power) studies. Also included are project proposals and authorizations, progress and status reports, test data, design specifications, and site acquisition records.