'The rich and poor nations' This is a conflation of earlier writings on developing countries (especially the Rede Lecture and the Gandhi Memorial Lecture) made by the Editor of 'Technology and Society' and approved by Blackett as a contribution to the journal. Includes correspondence with editor and 2 versions of the paper, 1971-1972. Correspondents include: RA Buchannan and Leonard Rotherham. 1971-1972