Ministry of Reconstruction files concerning trade relations and the Imperial Mineral Resources Bureau, 1917-1923, (fols. 1-143) papers, 1917-1918; (fols. 144-446) 'Proposed Imperial Mineral Resources Bureau, Imperial Conference and ore developments in the Empire', papers and correspondence, including discussion of raw material supplies, 1917-1920; (fols. 447-576) printed reports of the Bureau, 1923.